JP2008540679A - Concentrated terephthalic acid composition - Google Patents

Abstract

  The present invention relates to a composition containing terephthalic acid as a main component.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present invention to claims priority to US Provisional Application No. 60 / 682,768, filed on May 19, 2005. The disclosure of the provisional application is incorporated herein in its entirety.

FIELD OF THE INVENTION The present invention relates to a process for producing a concentrated carboxylic acid composition by contacting the carboxylic acid composition with a concentrated feed in a concentration zone to form a concentrated carboxylic acid composition, and Relates to a concentrated carboxylic acid composition produced by The present invention also relates to a method for removing the catalyst from the cooled carboxylic acid composition and the resulting composition.

Background of the Invention Terephthalic acid is produced commercially by oxidation of para-xylene in the presence of at least one catalyst, such as Co, Mn, and Br catalysts, and a solvent, typically acetic acid. Terephthalic acid is typically made to remove impurities formed as a result of oxidation of para-xylene.

  Terephthalic acid (TPA) is an intermediate in the production of condensation polymers and copolymers, especially polyesters and copolyesters, for plastics, fibers, films, coatings, containers, and other articles. Of particular commercial importance are poly (ethylene terephthalate), referred to as PET, polyesters of TPA and ethylene glycol (EG), and related copolyesters. Commercial production processes for TPA are generally based on multivalent transition metal catalyzed oxidation of p-xylene, generally using a promide promoter in acetic acid solvent. Due to the limited solubility of TPA in acetic acid under actual oxidation conditions, a slurry of crystalline agglomerates mainly containing TPA is usually formed in the oxidation reactor. Typically, the TPA oxidant slurry is removed from the reactor and TPA solids are separated from the oxidant mother liquor using conventional solid-liquid separation techniques. An oxidant mother liquor stream containing most of the catalyst and promoter used in the process is returned to the oxidation reactor. In addition to the catalyst and promoter, the oxidant mother liquor stream also contains dissolved TPA, as well as a number of by-products, impurities and other compounds. These other compounds, oxidation by-products, and impurities arise in part from compounds that are present in small amounts in the p-xylene feed stream. Other compounds and oxidation by-products result from incomplete oxidation of p-xylene, resulting in a partially oxidized product. Still other compounds, and oxidation byproducts, result from competing side reactions formed as a result of oxidation of p-xylene to terephthalic acid. Patents disclosing the production of terephthalic acid, for example, U.S. Pat. Nos. 4,158,738 and 3,996,271, are incorporated herein in their entirety to the extent not contrary to the description herein. To do.

  Many of the compounds in the returned oxidant mother liquor stream are relatively inert to further oxidation, but are not inert to further reactions including degradation and conversion to other compounds. Such compounds include, for example, isophthalic acid (IPA), benzoic acid, and phthalic acid. Compounds in the oxidant mother liquor stream that can undergo further oxidation include, for example, p-xylene (also referred to as 1,4-dimethylbenzene), compounds such as 4-carboxybenzaldehyde, p-toluic acid, p-tolualdehyde, And also in the case of the oxidation of terephthalaldehyde. Compounds that can be relatively inert to oxidation but are not removed from the process tend to accumulate in the oxidant mother liquor stream during recycling.

  Conventionally, crude terephthalic acid (CTA) is purified either by conversion to dimethyl ester or by dissolution in water followed by hydrogenation over a standard hydrogenation catalyst. More recently, secondary oxidation treatment instead of hydrogenation has been used to produce polymer grade TPA. It is desirable to minimize the concentration of impurities in the mother liquor and to facilitate subsequent purification of TPA. In some cases, purified polymer grade TPA cannot be produced if some means are not available to remove impurities from the oxidant mother liquor stream.

  One technique for impurity removal commonly used in the chemical processing industry is to extract or “purge” some portion of the mother liquor stream as a recycle stream. Typically, this purge stream is simply discarded or subject to various processes to remove unwanted impurities while recovering valuable compounds, if economically justified. . One example of this purge process is US Pat. No. 4,939,297, which is incorporated herein in its entirety to the extent that it is not contrary to the description herein.

  The production of CTA to produce purified terephthalic acid (PTA) increases the production cost of PTA. In particular, by-products, impurities in terephthalic acid to the extent that terephthalic acid remains useful in the manufacture of poly (ethylene terephthalate) (PTA) polymers and articles thereof, such as films, containers, and fibers. It is desirable to minimize the concentration of other compounds.

  One example of utility is improved yields in carboxylic acid processes, particularly terephthalic acid processes. Another utility of the present invention is to flexibly control the fate of a particular compound in the above process. For example, some of the specific compounds are retained on the product in the catalyst removal zone and / or in the product in the concentration zone so that they either exit the product stream or exit the process. Can be concentrated. A further utility is that the process allows an option to place the compound on a product stream that is not present in the TPA process. Another utility is that comonomer can be added with the option of adding a TPA product stream, such as IPA.

Summary of the Invention In a first aspect of the invention, the following:
(1) terephthalic acid in an amount greater than 50 weight percent;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or (b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm; or (2) (a) and ( 2) Both of (b); and (3) The following:
(A) isophthalic acid in an amount ranging from 50 ppm to 49 wt%;
(B) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm;
(C) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
(D) phthalic acid in an amount ranging from 20 ppm to 49 wt%;
(E) 4-hydroxybenzoic acid in an amount ranging from 3 ppm to 1000 ppm;
(F) 4-hydroxymethylbenzoic acid in an amount ranging from 40 ppm to 49 wt%; and (g) benzoic acid in an amount ranging from 60 ppm to 1000 ppm;
At least two of the
A terephthalic acid composition is provided.

In another aspect of the invention, the following:
(1) terephthalic acid in an amount greater than 50 weight percent;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or (b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm; or (2) (a) and ( 2) Both of (b); and (3) The following:
(A) isophthalic acid in an amount ranging from 50 ppm to 49 wt%;
(B) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm;
(C) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
(D) phthalic acid in an amount ranging from 20 ppm to 49 wt%;
(E) 4-hydroxybenzoic acid in an amount ranging from 3 ppm to 1000 ppm;
(F) 4-hydroxymethylbenzoic acid in an amount ranging from 40 ppm to 49 wt%; and (g) benzoic acid in an amount ranging from 60 ppm to 1000 ppm;
At least three of the
A terephthalic acid composition is provided.

In another aspect of the invention, the following:
(1) terephthalic acid in an amount greater than 50 weight percent;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or (b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm; or (2) (a) and ( 2) Both of (b); and (3) The following:
(A) isophthalic acid in an amount of at least 50 ppm;
(B) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm; and (c) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
At least two of the
A terephthalic acid composition is provided.

In another aspect of the invention, the following:
(1) terephthalic acid in an amount greater than 50 weight percent;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or (b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm; or (2) (a) and ( 2) Both of (b); and (3) The following:
(A) isophthalic acid in an amount of at least 50 ppm;
(B) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm;
(C) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
All of
A terephthalic acid composition is provided.

In another aspect of the invention, the following:
(1) terephthalic acid in an amount greater than 50 weight percent;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or (b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm; or (2) (a) and ( 2) Both of (b); and (3) The following:
(A) isophthalic acid in an amount ranging from 50 ppm to 49 wt%;
(B) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm;
(C) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
(D) phthalic acid in an amount ranging from 20 ppm to 49 wt%;
(E) 4-hydroxybenzoic acid in an amount ranging from 3 ppm to 1000 ppm;
(F) 4-hydroxymethylbenzoic acid in an amount ranging from 40 ppm to 49 wt%; and (g) benzoic acid in an amount ranging from 60 ppm to 1000 ppm;
At least five of
A terephthalic acid composition is provided.

In another aspect of the invention, the following:
(1) terephthalic acid in an amount greater than 50 weight percent;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or (b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm; or (2) (a) and ( 2) Both of (b); and (3) The following:
(A) isophthalic acid in an amount ranging from 50 ppm to 49 wt%;
(B) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm;
(C) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
(D) phthalic acid in an amount ranging from 20 ppm to 49 wt%;
(E) 4-hydroxybenzoic acid in an amount ranging from 3 ppm to 1000 ppm;
(F) 4-hydroxymethylbenzoic acid in an amount ranging from 40 ppm to 49 wt%; and (g) benzoic acid in an amount ranging from 60 ppm to 1000 ppm;
All of
A terephthalic acid composition is provided.

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described by reference to the following detailed description of preferred embodiments of the invention and the examples contained herein, as well as the drawings and their previous and following description. More easily understood.

  Before disclosing and describing compounds, compositions, articles, devices, and / or methods according to the present invention, it is understood that the present invention is not limited to a particular synthesis method, a particular process, or a particular device or equipment. Should, of course, change itself. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

  In the following specification and accompanying frames, a number of terms are defined that have the following meanings more defined.

  As used herein and in the appended claims, the singular forms “a”, “an”, and “the” include plural referents unless the context clearly indicates otherwise. Thus, for example, reference to “a” catalyst removal zone includes “one or more” catalyst removal zones.

  Ranges may be expressed herein as from “about“ about ”one specific value and / or to“ about “about” another specific value. Similarly, by use of the antecedent “about”, it will be understood that when the value is expressed as an approximate number, that particular value forms another aspect. It will further be appreciated that each endpoint of the range is significant with respect to and independent of the other endpoints.

  “Optional” or “as the case may be” means that the event or situation described thereafter may or may not occur, and the description includes the case where the event or situation occurs. , Which does not occur. For example, the phrase “optionally heated” means that the material is heated or not heated, and such phrases include both heated and unheated processes. Despite the approximate numerical ranges and parameters that define the broad scope of the invention, the numerical values set forth in the specific examples are reported as accurately as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their corresponding testing measurements.

The ranges set forth in the present disclosure and claims are intended to specifically encompass the entire range, not just the endpoints. For example, a range of 0-10 is any integer between 0-10, eg, 1, 2, 3, 4, etc., any decimal number between 0-10, eg, 1.5, 2.3, 3. 4.57, 6.113, etc., and is intended to disclose 0 and 10 endpoints. Also, ranges relating to chemical substituents such as “C ₁ -C ₅ hydrocarbons” specifically include and disclose C ₁ and C ₅ hydrocarbons, as well as C ₂ , C ₃ , and C ₄ hydrocarbons. Intended.

  In embodiments of the present invention, the post-catalyst composition (200) is optionally contacted with the concentrated feed (220) within the concentration zone (210). Slurry composition (70) or crystallization slurry composition (160) or cooled carboxylic acid composition (170) or crude carboxylic acid composition (30) are known in the art for producing carboxylic acid compositions. It can be made in a conventional manner. The slurry composition (70) or crystallization slurry composition (160) or cooled carboxylic acid composition (170) or crude carboxylic acid composition (30) is then used to dry carboxylic acid composition (280) or A concentrated composition (240) or dehydrated cake composition (260) is made. For example, one method of making the post-catalyst composition (200) is provided in FIGS. 1A and 1B.

  Step (A) in FIG. 1A includes oxidizing the aromatic feedstock (10) in the primary oxidation zone (20) to form a crude carboxylic acid composition (30). The aromatic feedstock (10) includes at least one oxidizable compound, at least one solvent, and at least one catalyst.

  One aspect of the present invention relates to liquid phase partial oxidation of oxidizable compounds. Such oxidation is preferably carried out in the liquid phase of the multiphase reaction medium contained in the stirred reactor. Suitable stirred reactors include, for example, a foam stirred reactor (eg, a foam column reactor) and a mechanical stirred reactor (eg, a continuous stirred tank reactor). Liquid phase oxidation is preferably carried out in a foam column reactor.

  As used herein, the term “bubble column reactor” refers to a multiphase reaction medium in which stirring of the reaction medium is provided primarily by the upward movement of gas bubbles through the reaction medium. It means a reactor for facilitating the chemical reaction. As used herein, the term “stirring” means the work of scattering into a reaction medium that causes liquid flow and / or mixing. As used herein, the terms “majority”, “primary”, and “predominantly” mean greater than 50%.

  The oxidizable compound present in the aromatic feedstock (10) preferably comprises at least one hydrocarbyl group. More preferably, the oxidizable compound is an aromatic compound. Even more preferably, the oxidizable compound comprises at least one attached hydrocarbyl group or at least one attached substituted hydrocarbyl group or at least one attached heteroatom or at least one attached carboxylic acid functional group ( -COOH). Even more preferably, the oxidizable compound is an aromatic compound having at least one attached hydrocarbyl group or at least one attached substituted hydrocarbyl group, wherein each attached group is from 1 to 5 carbon atoms. Is included. Even more preferably, the oxidizable compound is an aromatic compound having two attachment groups, each attachment group containing one carbon atom, and a methyl group and / or a substituted methyl group, and / or many Both consist of one carboxylic acid group. Even more preferably, the oxidizable compound is paraxylene, metaxylene, paratolualdehyde, metatolualdehyde, paratoluic acid, metatoluic acid, and / or acetaldehyde, more preferably the oxidizable compound is paraxylene. It is.

  As defined herein, a “hydrocarbyl group” is at least one carbon atom that is bonded only to hydrogen atoms or other carbon atoms. As defined herein, a “substituted hydrocarbyl group” is at least one carbon atom engaged with at least one heteroatom and at least one hydrogen atom. As defined herein, a “heteroatom” preferably includes an aromatic ring having at least 6 carbon atoms, and even more preferably having only carbon atoms as part of the ring. Suitable examples of such aromatic rings include, but are not limited to, benzene, biphenyl, terphenyl, naphthalene, and other carbon-based fused aromatic rings.

  Suitable examples of oxidizable compounds include aliphatic hydrocarbons (eg, alkanes, branched alkanes, cyclic alkanes, aliphatic alkenes, branched alkenes, and cyclic alkenes); aliphatic aldehydes (eg, acetaldehyde, propionaldehyde, Isobutyraldehyde, and n-butyraldehyde); aliphatic alcohols (eg, ethanol, isopropanol, n-propanol, n-butanol, and isobutanol); aliphatic ketones (eg, dimethyl ketone, ethyl methyl ketone, diethyl ketone, and Isopropyl methyl ketone); aliphatic esters (eg, methyl formate, methyl acetate, ethyl acetate); aliphatic peroxides, peracids, hydroperoxides (eg, t-butyl hydroheroxide, peracetic acid, and di-t-) Butyl hydroperoxide); Aliphatic compounds having groups that are combinations of aliphatic species and other heteroatoms (eg, hydrocarbons, aldehydes, alcohols, ketones, esters, peroxides, peracids with sodium, bromine, cobalt, manganese, and zirconium) And / or aliphatic compounds containing one or more molecular segments of hydroperoxide); various benzene rings, naphthalene rings, biphenyl, terphenyl, and other aromatic groups with one or more attached hydrocarbyl groups. (E.g., toluene, ethylbenzene, isopropylbenzene, n-propylbenzene, neopentylbenzene, paraxylene, metaxylene, orthoxylene, all isomers of trimethylbenzene, all isomers of tetramethylbenzene, pentamethylbenzene , Hexamethylbenzene, ethyl All isomers of rubenzene, all isomers of diethylbenzene, all isomers of ethyldimethylbenzene, all isomers of dimethylnaphthalene, all isomers of ethylmethylnaphthalene, all isomers of diethylnaphthalene, dimethylbiphenyl All isomers of ethylmethylbiphenyl, and all isomers of diethylbiphenyl, stilbene and having one or more attached hydrocarbyl groups, fluorene and one or more attached hydrocarbyl groups, anthracene and Those having one or more attached hydrocarbyl groups, and those having biphenylethane and one or more attached hydrocarbyl groups); various benzene rings, naphthalene rings, biphenyl, terphenyl, and other aromatic groups, Attached hydrocarbyl groups and / or 1 Those with attached heteroatoms (which can engage other atoms or groups of atoms) (eg phenol, all isomers of methylphenol, all isomers of dimethylphenol, all isomers of naphthol, Benzyl methyl ether, all isomers of bromophenol, bromobenzene, all isomers of bromotoluene including alpha bromotoluene, all isomers of dibromobenzene, cobalt naphthenate, and bromobiphenyl); various benzene rings, naphthalene Rings, biphenyl, terphenyl, and other aromatic groups having one or more attached hydrocarbyl groups and / or one or more attached heteroatoms and / or one or more attached substituted hydrocarbyl groups (eg, benzaldehyde, All isomers of bromobenzaldehyde, alpha bromotol All isomers of brominated tolaldehyde, including all isomers of aldehyde, all isomers of hydroxybenzaldehyde, all isomers of bromohydrobenzaldehyde, all isomers of benzenedicarboxaldehyde, benzenetricarboxaldehyde All isomers, p-tolualdehyde, meta-tolualdehyde, ortho-tolualdehyde, all isomers of toluene dicarboxaldehyde, all isomers of toluent carboxaldehyde, all isomers of toluene tetracarboxaldehyde, dimethylbenzene di All isomers of carboxaldehyde, all isomers of dimethylbenzene tricarboxaldehyde, all isomers of dimethylbenzene tetracarboxaldehyde, all of trimethylbenzene tricarboxaldehyde Isomers, all isomers of ethyl tolualdehyde, all isomers of trimethylbenzene dicarboxaldehyde, all isomers of tetramethylbenzene dicarboxaldehyde, hydroxymethylbenzene, hydroxymethyltoluene, all of hydroxymethylbromotoluene Of all isomers of hydroxymethyl tolualdehyde, all isomers of hydroxymethyl bromotolualdehyde, all isomers of benzyl hydroperoxide, benzoyl hydroperoxide, tolyl methyl hydroperoxide, and methylphenol methyl hydroperoxide All isomers);

  Various benzene rings, naphthalene rings, biphenyl, terphenyl, and other aromatic groups having one or more attached select groups, wherein the select groups are hydrocarbyl groups and / or attached heteroatoms and / or Having a substituted hydrocarbyl group and / or carboxylic acid group and / or peroxy acid group (for example, all isomers of benzoic acid, paratoluic acid, metatoluic acid, orthotoluic acid, ethylbenzoic acid, all isomers of propylbenzoic acid) , All isomers of butylbenzoic acid, all isomers of pentylbenzoic acid, all isomers of dimethylbenzoic acid, all isomers of ethylmethylbenzoic acid, all isomers of trimethylbenzoic acid, tetramethylbenzoic acid All isomers of acid, all isomers of pentamethylbenzoic acid, diethylbenzoic acid, all of benzene dicarboxylic acid Isomers, all isomers of benzenetricarboxylic acid, all isomers of methylbenzene dicarboxylic acid, all isomers of dimethylbenzene dicarboxylic acid, all isomers of methylbenzene tricarboxylic acid, all of bromobenzoic acid Isomers, all isomers of dibromobenzoic acid, all isomers of bromotoluic acid including alpha bromotoluic acid, all isomers of tolylacetic acid, hydroxybenzoic acid, all isomers of hydroxymethylbenzoic acid, hydroxytoluyl All isomers of acid, all isomers of hydroxymethyltoluic acid, all isomers of hydroxymethylbenzene dicarboxylic acid, all isomers of hydroxybromobenzoic acid, all isomers of hydroxybromotoluic acid, hydroxy All isomers of methylbromobenzoic acid, carboxybenzal All isomers of hydride, all isomers of dicarboxybenzaldehyde, all isomers of perbenzoic acid, hydroperoxymethylbenzoic acid, all isomers of hydroperoxymethylhydroxybenzoic acid, all of hydroperoxycarbonylbenzoic acid All isomers of hydroperoxycarbonyltoluene, all isomers of methylbiphenyl carboxylic acid, all isomers of dimethyl biphenyl carboxylic acid, all isomers of methyl biphenyl dicarboxylic acid, all of biphenyl tricarboxylic acid All isomers of stilbene with one or more attachment-selective groups, all isomers of fluorenone with one or more attachment-selection groups, or all isomers of naphthalene. Having one or more attachment-selective groups, benzyl, ben All isomers of zil with one or more attachment-selective groups, benzophenone, all isomers of benzophenone with one or more attachment-selection groups, anthraquinone, anthraquinone with one or more attachments All having the selection group, all isomers of diphenylethane having one or more attachment selection groups, all isomers of benzocoumarin and benzocoumarin having one or more attachment selection groups) including.

  It should be understood that the oxidizable compound present in the liquid phase feed may include a combination of two or more different oxidizable chemicals. These two or more different chemical materials can be mixed fed into the aromatic feedstock (10) or can be fed separately in multiple feed streams. For example, an aromatic feed comprising para-xylene, meta-xylene, p-tolualdehyde, p-toluic acid, and acetaldehyde can be fed into the reactor through a single inlet or multiple inlets.

  The solvent present in the aromatic feedstock (10) preferably includes an acid component and a water component. In one embodiment of the invention, the solvent is preferably in the range of about 60 to about 98 weight percent, more preferably in the range of about 80 to about 96 weight percent, and most preferably about 85 to 94 weight percent. Present in the aromatic feedstock (10) at concentrations within the range. The acid component of the solvent is preferably an organic low molecular weight monocarboxylic acid having 1 to 6 carbon atoms, more preferably 2 carbon atoms. More preferably, the acid component of the solvent is acetic acid. Preferably, the acid component comprises at least about 75 weight percent of the solvent, more preferably at least about 80 weight percent of the solvent, and most preferably 85 to 98 weight percent of the solvent with the balance being water.

  Suitable solvents include, but are not limited to, aliphatic monocarboxylic acids preferably containing 2 to 6 carbon atoms, or benzoic acid and mixtures thereof and mixtures of these compounds with water.

  The catalyst system present in the aromatic feedstock (10) is preferably a homogeneous liquid phase catalyst system capable of promoting the oxidation (including partial oxidation) of oxidizable compounds. More preferably, the catalyst system comprises at least one multivalent transition metal. Even more preferably, the multivalent transition metal comprises cobalt. Even more preferably, the catalyst system comprises cobalt and bromine. More preferably, the catalyst system comprises cobalt, bromine, and manganese.

  When cobalt is present in the catalyst system, the amount of cobalt present in the aromatic feedstock (10) is such that the concentration of cobalt in the liquid phase of the reaction medium in the primary oxidation zone (20) is about 300 to about Be maintained within the range of 6,000 ppm by weight (ppmw), more preferably within the range of about 700 to about 4,200 ppmw, and most preferably within the range of 1,200 to 3,000 ppmw. Is preferred. When bromine is present in the catalyst system, the amount of bromine present in the aromatic feedstock is such that the bromine concentration in the liquid phase of the reaction medium is in the range of about 300 to about 5,000 ppmw, more preferably about 600. It is preferred that it be maintained in the range of about ~ 4,000 ppmw, and most preferably in the range of about 900 to 3,000 ppmw. When manganese is present in the catalyst system, the amount of manganese present in the aromatic feedstock (10) is more preferably in the range of about 20 to about 1,000 ppmw of manganese in the liquid phase of the reaction medium. Is preferably such that it is maintained within the range of about 40 to about 500 ppmw, and most preferably within the range of 50 to 200 ppmw.

  The concentrations of cobalt, bromine and / or manganese in the liquid phase of the reaction medium provided above are expressed on the basis of time average and constitution average. As used herein, the term “time average” means the average of at least 10 measurements taken over a continuous 100 second time period. As used herein, the term “volume average” means the average of at least 10 measurements taken in a uniform three-dimensional spacing through a fixed volume.

  The weight ratio of cobalt to bromine (Co: Br) in the catalyst system introduced into the primary oxidation zone (20) is preferably in the range of about 0.25: 1 to about 4: 1, more preferably about Within the range of 0.5: 1 to about 3: 1 and most preferably within the range of 0.75: 1 to 2: 1. The weight ratio of cobalt to manganese (Co: Mn) in the catalyst system introduced into the primary oxidation zone (20) is preferably in the range of about 0.3: 1 to about 40: 1, more preferably about Within the range of 5: 1 to about 30: 1 and most preferably within the range of 10: 1 to 25: 1.

  The aromatic feedstock (10) introduced into the primary oxidation zone (20) contains small amounts of compounds such as metaxylene, orthoxylene, toluene, ethylbenzene, 4-carboxybenzaldehyde (4-CBA), benzoic acid, p-toluic acid. , P-toluyl aldehyde, p-bromo p-toluic acid, isophthalic acid, phthalic acid, trimellitic acid, polyaromatic compounds, and / or suspended particles.

  Step (b) optionally includes removing at least a portion of the oxidation byproduct from the crude carboxylic acid composition (30) in the liquid exchange zone (40) to form a slurry composition (70). .

  The crude carboxylic acid composition (30) comprises at least one carboxylic acid, at least one catalyst, at least one solvent, and at least one oxidation byproduct, at least a portion of which is removed via line (60). It is. Oxidation byproducts typically include at least one or more of the following classes of compounds and isomers thereof: carboxylic acids, aldehydes, hydroxy aldehydes, carboxaldehydes, ketones, alcohols, and hydrocarbons. In the case of the oxidation of p-xylene, the oxidation by-product typically comprises at least one of the following compounds: 4-carboxybenzaldehyde, p-toluic acid, p-tolualdehyde, isophthalic acid, Phthalic acid, benzoic acid, trimellitic acid, 4,4′-dicarboxybiphenyl, 2,6- and 2,7-dicarboxyfluorenone, 2,6-dicarboxyanthraquinone, 4,4′-dicarboxybenzophenone, 4, , 4′-dicarboxybiphenyl, and α-bromo-p-toluic acid. The solvent typically includes acetic acid, but may be any of the abbreviated solvents.

  The crude carboxylic acid composition (30) is produced by oxidizing the aromatic feedstock (10) in the primary oxidation zone (20). In one embodiment, the aromatic feedstock (10) comprises paraxylene. The primary oxidation zone (20) includes at least one oxidation reactor. The crude carboxylic acid composition (30) comprises at least one carboxylic acid.

  In one aspect of the invention, the oxidation reactor can be operated at a temperature of about 110 ° C. to about 200 ° C .; the other range is about 140 ° C. to about 170 ° C. Typically, the oxidizable compound in the aromatic feedstock (10) is para-xylene and the carboxylic acid produced is terephthalic acid. In one embodiment of the present invention, the primary oxidation zone (20) comprises a bubble column.

  Carboxylic acids include carboxylic acids from either aromatic carboxylic acids produced via controlled oxidation of organic substrates or from the oxidation of oxidizable compounds described above. Such aromatic carboxylic acids are preferably compounds having at least one carboxylic acid group attached to a carbon atom that is part of an aromatic ring, preferably having at least 6 carbon atoms, even more preferably only carbon atoms. including. Suitable examples of such aromatic rings include, but are not limited to, benzene, biphenyl, terphenyl, naphthalene, and other carbon-based fused aromatic rings. Examples of suitable carboxylic acids include, but are not limited to, terephthalic acid, benzoic acid, p-toluic acid, phthalic acid, isophthalic acid, trimellitic acid, naphthalene dicarboxylic acid, and 2,5-diphenyl terephthalic acid.

  The crude terephthalic acid slurry is conventionally produced via liquid phase oxidation of paraxylene in the presence of a suitable oxidation catalyst. In other embodiments of the invention, suitable catalysts include cobalt, manganese, and bromine compounds that are soluble in a non-limiting selected solvent.

  The crude carboxylic acid composition in conduit (30) is optionally fed to a liquid exchange zone (40) that can remove a portion of the liquid contained in the crude carboxylic acid composition (30), A slurry composition is produced in conduit (70). In the aspect of the present invention, a part means that at least 5% by weight of the liquid is removed. In another aspect of the invention, a portion means that at least 10% by weight of the liquid is removed. In another aspect of the invention, a portion means that at least 15% by weight of the liquid is removed. In another aspect of the invention, a portion means that at least 25% by weight of the liquid is removed. In another aspect of the invention, a portion means that at least 35% by weight of the liquid is removed. In another aspect of the invention, a portion means that at least 45% by weight of the liquid is removed. In another aspect of the invention, a portion means that at least 55% by weight of the liquid is removed. In another aspect of the invention, a portion means that at least 65% by weight of the liquid is removed. In another aspect of the invention, a portion means that at least 75% by weight of the liquid is removed. In another aspect of the invention, a portion means that at least 85% by weight of the liquid is removed. In other aspects of the invention, a portion can mean any portion up to the total weight of the liquid.

  Removal of a portion of the liquid to produce the slurry composition in conduit (70) can be accomplished by any means known in the art. Typically, the liquid exchange zone (40) is selected from the group consisting of decanter centrifuges, separator plate centrifuges, vacuum belt filters, rotary vacuum filters, rotary pressure filters, perforated basket centrifuges, and the like. A solid-liquid separator. The crude carboxylic acid composition in conduit (30) is fed to a liquid exchange zone (40) comprising at least one solid-liquid separator. In one aspect of the invention, the solid-liquid separator can be operated at a temperature of about 5 ° C to about 200 ° C. In yet other ranges, the solid-liquid separator can be operated in the range of about 90 ° C to about 170 ° C. In yet other ranges, the solid-liquid separator can be operated in the range of about 140 ° C to about 170 ° C. The solid-liquid separator can be operated at pressures up to 200 psig. In yet other ranges, the solid-liquid separator can be operated at a pressure of about 30 psig to about 200 psig. The solid-liquid separator in the liquid exchange zone (40) can be operated in continuous or batch mode. However, it will be appreciated that continuous mode is preferred for commercial processes.

  A portion of the oxidation byproduct is removed from the liquid exchange zone (40) in the mother liquor and removed via line (60). In one embodiment of the invention, additional solvent is fed to the liquid exchange zone (40) via line (50) to reslurry the crude carboxylic acid composition (30) and the slurry composition is It is formed. The mother liquor (60) is removed from the liquid exchange zone (40) via line (60) and contains a solvent, typically acetic acid, a catalyst, and at least one oxidation byproduct. The mother liquor in line (60) is either sent to a process for separating impurities from the oxidizing solvent via a line not shown or returned to the catalyst system via an uninsulated line. It is possible. One technique for removing impurities from the mother liquor (60) commonly used in the chemical processing industry is to drain or “purge” some portion of the recycle stream. Typically, the purge stream is simply discarded or, if economically justified, subjected to various processes to remove unwanted impurities while recovering valuable components. . Examples of impurity removal processes include U.S. Pat. Nos. 4,939,297 and 4,356,319, which are incorporated herein to the extent that they do not violate the references herein. .

  In embodiments of the present invention, at least one selected compound, by-product or from the filtered mother liquor, the wash feed, and the terephthalic acid wet cake, while achieving the recovery of the oxidation catalyst and oxidation reaction solvent or medium. A process is described that allows controlled fractionation of impurities.

  Also, in aspects of the invention, the purge process is significantly reduced or eliminated by concentrating the post-catalyst composition (200) containing the selected compound. The concentration process significantly reduces or eliminates the purge process because those compounds will be performed with the concentrated composition (240) or dry carboxylic acid composition (280). Concentration can precede the catalyst removal process.

  It should be noted that the liquid exchange zone (40) is optional and can also be placed at a number of locations within the process as indicated by the dotted lines in FIG. In other embodiments of the invention, two or more liquid exchange zones (40) are present, for example, between the primary oxidation zone (20) and the staged oxidation zone (80), and other liquid exchange zones ( 40) can be placed either after the staged oxidation zone (80) or after the crystallization zone (120). There may be three liquid exchange zones (40) as shown in FIG. 2 or any combination shown in FIG.

  Step (c) optionally oxidizes the slurry composition (70) or the crude carboxylic acid composition (30) in the graded oxidation zone (80) to form the graded oxidation composition (110). including.

  In one embodiment of the invention, the slurry composition (70) or crude carboxylic acid composition (30) is withdrawn via line (70) to the staged oxidation zone (80) and from about 140 ° C to about It can be heated to 280 ° C. The other range is from about 160 ° C. to about 240 ° C., the other range is from about 170 ° C. to about 200 ° C., and is further oxidized by the air fed by line (106) to produce a graded oxidation composition. (110) is manufactured. Another range is from about 180 ° C to about 280 ° C.

  The staged oxidation zone (80) includes at least one staged oxidation reaction vessel. The slurry composition (70) is fed to the staged oxidation zone (80). The term “staged” means that oxidation occurs in both the primary oxidation zone (20) and the staged oxidation zone (80) described above. For example, the staged oxidation zone (80) may include a series of staged oxidation reaction vessels.

  When the carboxylic acid is terephthalic acid, the graded oxidation zone (80) is about 140 ° C to about 280 ° C or about 160 ° C to about 240 ° C, or about 170 ° C to about 200 ° C, or about 160 ° C to about 210 ° C. A staged oxidation composition (110) is produced that includes an oxidation reactor that can be heated to 0 C and is further oxidized by air or a molecular oxygen source fed by line (106). In one embodiment of the invention, the oxidation in the staged oxidation zone (80) is at a higher temperature than the oxidation in the primary oxidation zone (20) to enhance impurity removal. The staged oxidation zone (80), as well as the streams (30) and (70), can be heated directly by solvent vapor or steam or indirectly by any means known in the art. Purification within the staged oxidation zone (80) occurs by a mechanism that includes recrystallization or crystal growth and oxidation of impurities.

  Additional air or molecular oxygen is partially oxidized product in the crude carboxylic acid composition (30) or slurry composition (70) to the staged oxidation zone (80) via conduit (106). For example, at least a portion of 4-carboxybenzaldehyde (4-CBA) and p-toluic acid can be fed in the amount necessary to oxidize to the corresponding carboxylic acid. Generally, at least 70% by weight of 4-CBA is converted to terephthalic acid in the staged oxidation zone (80). Preferably, at least 80% by weight of 4-CBA is converted to terephthalic acid in the staged oxidation zone (80). Significant concentrations of 4-carboxybenzaldehyde and p-toluic acid in the terephthalic acid product are particularly detrimental to the polymerization process. This is because they can act as a chain terminator during the condensation reaction between terephthalic acid and ethylene glycol in the production of polyethylene terephthalate (PET).

  Impurities in the crude carboxylic acid composition (30) or slurry composition (70) enter the solution. This is because the terephthalic acid particles are dissolved and recrystallized in the staged oxidation zone (80). Off-gas from the staged oxidation zone (80) can be removed and fed to a recovery system, where the solvent is removed from the off-gas containing volatile organic compounds (VOCs). VOCs containing methyl bromide can be treated, for example, by ashing in a catalytic oxidation unit. The off-gas may be treated before staged oxidizing composition (110) from staged oxidation zone (80) is removed from line (110).

  Step (d) optionally crystallizes the slurry composition (70) or crude carboxylic acid composition (30) or graded oxidation composition (110) in the crystallization zone (120) to produce a crystallization slurry composition. Forming an object (160). Generally, the crystallization zone (120) includes at least one crystallizer. The vapor product from the crystallization zone (120) is condensed in at least one condenser and returned to the crystallization zone (120). Optionally, the liquid from the condenser or the vapor product from the crystallization zone (120) can be recycled or removed or sent to an energy recovery device.

  Further, the crystallizer off-gas can be removed and directed to a recovery system where the solvent is removed and the crystallizer off-gas containing VOCs can be processed, for example, by ashing in a catalytic oxidation unit.

  Staged oxidation composition (110) from staged oxidation zone (80) is withdrawn via line (110) and fed to crystallization zone (120) comprising at least one crystallizer, where about Cooled to form a crystallization slurry composition (160) to a temperature of 110 ° C to about 190 ° C, preferably to a temperature of about 140 ° C to about 180 ° C and most preferably to a temperature of about 150 ° C to about 170 ° C. Is done.

  Crystallized slurry composition (160) from crystallization zone (120) is removed via line (160). Typically, the crystallized slurry composition (160) is then fed directly into the vessel and cooled to form a cooled carboxylic acid composition (170). When the carboxylic acid is terephthalic acid, the cooled carboxylic acid composition (170) is typically about 160 ° C. or less before being introduced into the process for recovering terephthalic acid as a dry powder or wet cake. Is cooled in the vessel to a temperature below about 100 ° C.

  Step (e) optionally comprises crystallization slurry composition (160) or graded oxidation composition (110) or slurry composition (70) or crude carboxylic acid composition (30) in cooling zone (165). Cooling to form a cooled carboxylic acid composition (170).

  Crystallized slurry composition (160) or graded oxidation composition (110) or slurry composition (70) or crude carboxylic acid composition (30) is fed to cooling zone (165) and from about 5 ° C to about 5 ° C. Cooled to a temperature of 160 ° C., about 5 ° C. to about 90 ° C., or about 5 ° C. to about 195 ° C. or about 20 ° C. to about 160 ° C. to form a cooled carboxylic acid composition (170). In another aspect of the invention, the crystallization slurry composition (160) or the graded oxidation composition (110) or the slurry composition (70) or the crude carboxylic acid composition (30) is placed in the cooling zone (165). Feeded and cooled to a temperature in the range of about 20 ° C. to about 95 ° C. to form a cooled carboxylic acid composition (170). In another aspect of the invention, the crystallization slurry composition (160) or the graded oxidation composition (110) or the slurry composition (70) or the crude carboxylic acid composition (30) is placed in the cooling zone (165). Feeded and cooled to a temperature in the range of about 20 ° C. to about 120 ° C. to form a cooled carboxylic acid composition (170). In another aspect of the invention, the crystallization slurry composition (160) or the graded oxidation composition (110) or the slurry composition (70) or the crude carboxylic acid composition (30) is placed in the cooling zone (165). Feeded and cooled to a temperature in the range of about 10 ° C. to about 90 ° C. to form a cooled carboxylic acid composition (170). In another aspect of the invention, the crystallization slurry composition (160) or the graded oxidation composition (110) or the slurry composition (70) or the crude carboxylic acid composition (30) is placed in the cooling zone (165). Feeded and cooled to a temperature in the range of about 20 ° C. to about 60 ° C. to form a cooled carboxylic acid composition (170). In another aspect of the invention, the crystallization slurry composition (160) or the graded oxidation composition (110) or the slurry composition (70) or the crude carboxylic acid composition (30) is placed in the cooling zone (165). Feeded and cooled to a temperature in the range of about 20 ° C. to about 40 ° C. to form a cooled carboxylic acid composition (170).

  In other aspects of the invention, some of the solvent is optionally crystallization slurry composition (160) or graded oxidation composition (110) or slurry composition (70) or crude carboxylic acid composition (30). ) Through conduit (163) to produce cooled carboxylic acid composition (170). In one embodiment of the present invention, a part may mean any part up to the whole. Partially means that at least 5% by weight of the solvent is removed. In another aspect of the invention, a portion means that at least 10% by weight of the solvent is removed. In another aspect of the invention, a portion means that at least 25% by weight of the solvent is removed. In another aspect of the invention, a portion means that at least 50% by weight of the solvent is removed. In another aspect of the invention, a portion means that at least 75% by weight of the solvent is removed. In another aspect of the invention, a portion means that at least 85% by weight of the solvent is removed. In another aspect of the invention, a portion is that at least 90% by weight of the solvent is crystallized slurry composition (160) or graded oxidation composition (110) or slurry composition (70) or crude carboxylic acid composition. Means removed from object (30).

  Removal of the solvent can be accomplished by any means known in the art. For example, the solvent can be removed by evaporation or by flushing and by removing the solvent under vacuum.

In other embodiments of the invention, both cooling and solvent removal are utilized.
Step (a) -step (d) and step (a) -step (e) illustrate aspects of the invention where a cooled carboxylic acid composition (170) is produced. It should also be noted that in this aspect of the invention, the liquid exchange zone (40), the staged oxidation zone (80), and the crystallization zone (120) are all optional. For example, a cooled carboxylic acid composition (170) or crystallization slurry composition (160), or a graded oxidation composition (110), or a slurry composition (70), or a crude carboxylic acid composition (30) is produced. Other processes can also be utilized. Such a process is described in U.S. Patent Nos. 5,877,346; 4,158,738; 5,840,965; 5,877,346; 5,527,957. No .; and 5,175,355, all of which are hereby incorporated by reference in their entirety to the extent that they do not violate the references herein. Thus, as shown in FIG. 3, processes known in the art that can produce a crystallized slurry composition (160) may also be utilized. Furthermore, as shown in FIG. 4, processes known in the art that can produce a crude carboxylic acid composition (30) or a slurry composition (70) may also be utilized.

  In general, as shown in FIG. 5, as long as the carboxylic acid composition or cooled carboxylic acid composition (170) includes at least one carboxylic acid, at least one solvent, and at least one catalyst, any carboxylic acid composition ( 214) can also be used in step (f). The carboxylic acid can be either a carboxylic acid disclosed above or a carboxylic acid that can be prepared by oxidation of an oxidizable compound disclosed above. The solvent is typically acetic acid, but can be any of the previously disclosed solvents. The catalyst is any of the previously disclosed catalysts. FIG. 6 shows a process utilizing the cooled carboxylic acid composition (170) in step (f).

  Step (f) comprises the step of: Or the crude carboxylic acid composition (30) is contacted with a wash liquor feed (175) and optionally a concentrate feed (220) to provide catalyst enriched liquor (185), wash liquor stream (62), optional consumable concentration. Forming a liquid stream (230) and forming a composition (200) after catalyst removal.

  The cooled carboxylic acid composition (170), or the crystallization slurry composition (160), or the graded oxidation composition (110) or slurry composition (70), or the crude carboxylic acid composition (30) is in the catalyst removal zone. (180) is contacted with the cleaning fluid supply (175). In one aspect of the invention, the cooled carboxylic acid composition (170) may be present in the form of a dry powder, wet cake, liquid or gas entrained liquid, solid, slurry, solution, or combinations thereof.

  The cleaning liquid feed (175) is fed into the cooled carboxylic acid composition (170), or the crystallization slurry composition (160), or the graded oxidation composition (110) or slurry composition (70) in the catalyst removal zone (180). ) Or the crude carboxylic acid composition (30) to remove a portion of the catalyst from the cooled, purified carboxylic acid composition (170) to form the catalyst-removed composition (200). In one aspect of the present invention, the post-catalyst composition (200) comprises carboxylic acid, solvent, catalyst, and optionally isophthalic acid, phthalic acid, trimellitic acid, hydroxymethylbenzoic acid isomer, hydroxybenzoic acid. It includes one or more compounds selected from the group consisting of isomers, benzoic acid, and toluic acid isomers. In another aspect of the invention, the catalyst-removed composition (200) comprises a carboxylic acid, a solvent, and optionally isophthalic acid, phthalic acid, trimellitic acid, benzoic acid, 4-hydroxybenzoic acid, 4-hydroxymethyl. Benzoic acid, 4,4′-dicarboxybiphenyl, 2,6-dicarboxyanthraquinone, 4,4′-dicarboxystilbene, 2,5,4′-tricarboxybiphenyl, 2,5,4′-tricarboxybenzophenone 4,4′-dicarboxybenzophenone, 4,4′-dicarboxybenzyl, formacetohydroxybenzoic acid, acetohydroxymethylbenzoic acid, α-bromo-p-toluic acid, bromobenzoic acid, bromoacetic acid, p-tolue It includes one or more compounds selected from the group consisting of aldehydes and terephthalaldehyde. In one aspect of the invention, the post-catalyst composition (200) may be present in the form of a dry powder, wet cake, slurry, solution, liquid, gas entrained liquid or solid. In other aspects of the invention, the post-catalyst composition (200) may comprise any of the compositions suitable for producing the dry carboxylic acid composition (280) described below.

  A portion of the catalyst may be passed through a catalyst enriched liquid (185) and a cleaning liquid (62) to provide a cooled carboxylic acid composition (170), or a crystallization slurry composition (160), or a graded oxidation composition (110). Or removed from the slurry composition (70) or crude carboxylic acid composition (30) to produce a post-catalyst removal composition (200) having a catalyst concentration of less than 1000 ppm by weight. The catalyst enriched liquid (185) includes a solvent, a catalyst, and an oxidation byproduct. The cleaning liquid (62) includes at least one solvent, at least one catalyst, and at least one oxidation byproduct. As used herein, the catalyst may be at least one catalyst as described above in the catalyst system. In other aspects of the invention, the catalyst may be any of the catalysts used in aromatic feedstock oxidation reactions. In another aspect of the invention, a portion of the catalyst is removed, at which time the post-catalyst composition (200) has a catalyst concentration of less than 50 ppm by weight. In another aspect of the present invention, a portion refers to the amount of catalyst from which the catalyst has been removed so that the post-catalyst composition (200) has a catalyst concentration of less than 250 ppm by weight. In another aspect of the present invention, a portion refers to the amount of catalyst from which the catalyst has been removed so that the post-catalyst composition (200) has a catalyst concentration of less than 75 ppm by weight. Other ranges are less than 50 ppm by weight. In yet other ranges, the catalyst concentration of the composition after removal of catalyst (200) is less than 20 ppm by weight or less than 10 ppm by weight. In yet other ranges, the catalyst concentration is less than 5 ppm by weight or less than 1 ppm by weight. As used herein, “catalyst concentration” means the total concentration of all catalysts in the composition.

  The cleaning liquid feed (175) includes a composition that can produce the previously disclosed catalyst removal composition (200). In one aspect of the invention, the cleaning liquid feed (175) may be present in the form of a liquid or condensable vapor or solution. In another aspect of the invention, the cleaning fluid feed (175) is greater than 50% by weight water. In another embodiment of the invention, the cleaning fluid feed (175) is greater than 75 wt% water. In another embodiment of the invention, the cleaning fluid feed (175) is greater than 90% by weight water. In another embodiment of the invention, the cleaning fluid feed (175) is greater than 50% by weight solvent. In another embodiment of the invention, the cleaning fluid feed (175) is greater than 75% by weight solvent. In another embodiment of the present invention, the wash feed (175) is greater than 90% by weight solvent. In another aspect of the invention, the cleaning fluid feed (175) comprises at least one solvent and optionally benzoic acid, isophthalic acid, phthalic acid, trimellitic acid, hydroxybenzoic acid isomer, hydroxymethylbenzoic acid isomerism. And at least one compound selected from the group consisting of p-toluic acid. In another aspect of the invention, the cleaning fluid feed (175) comprises sufficient composition to produce the dry carboxylic acid composition (280) disclosed below. In another aspect of the present invention, the cleaning fluid feed (175) comprises at least one solvent and optionally isophthalic acid, phthalic acid, trimellitic acid, hydroxymethylbenzoic acid isomer, hydroxybenzoic acid isomer, benzoic acid. Acid, and at least one compound selected from the group consisting of toluic acid isomers, wherein at least one of the compounds is concentrated above the concentration of the composition (200) after catalyst removal. . In another aspect of the invention, the cleaning liquid feed (175) comprises at least one solvent and optionally isophthalic acid, phthalic acid, trimellitic acid, benzoic acid, 4-hydroxybenzoic acid, 4-hydroxymethylbenzoic acid. Acid, 4,4′-carboxybiphenyl, 2,6-dicarboxyanthraquinone, 4,4′-dicarboxystilbene, 2,5,4′-tricarboxybiphenyl, 2,5,4′-tricarboxybenzophenone, 4 , 4′-dicarboxybenzophenone, 4,4′-dicarboxybenzyl, formacetohydroxybenzoic acid, acetohydroxymethylbenzoic acid, α-bromo-p-toluic acid, bromobenzoic acid, p-tolualdehyde, and terephthalaldehyde One or more compounds selected from the group consisting of:

  In one aspect of the invention, the wash feed is from the freezing point of the solvent to about 90 ° C, or from about 5 ° C to about 90 ° C, or from about 5 ° C to about 195 ° C, or from about 5 ° C to about Having a temperature of 100 ° C. or from the freezing point of the solvent to about 70 ° C., or from about 5 ° C. to about 70 ° C., or from about 30 ° C. to about 70 ° C., or from the freezing point of the solvent to about 30 ° C. .

  In one aspect of the invention, the cleaning liquid ratio is about 0.2 to about 6.0, or about 0.2 to about 4.0, or about 0.2 to about 1.0, or about 0.4. To about 1, or about 0.5 to about 2.0, or about 1 to about 3. As used herein, “cleaning liquid ratio” means a value obtained by dividing the total mass of the cleaning liquid supply (175) on a dry solid basis by the mass of the composition after removal of the catalyst (200). .

  The catalyst removal zone (180) can be a cooled carboxylic acid composition (170) or a crystallization slurry composition (160), a graded oxidation composition (110) or a slurry composition (70), or a crude carboxylic acid composition ( 30) includes at least one solid-liquid separation device that can be contacted with a cleaning liquid feed (175) to produce a post-catalyst composition (200).

  For example, the catalyst removal zone (180) includes one solid-liquid separation device in which the post-catalyst composition (200) is produced and then washed with a washing solvent. Examples include, but are not limited to, rotary vacuum rotary drum filters, vacuum belt filters, rotary pressure filters, filter presses, and pressure leaf filters. A solid-liquid separation device that can produce a cake but does not allow washing is also useful when used in combination with a reslurry device. Solid-liquid separation tank values, for example, a solid bowl centrifuge, can be used to produce a cake, and the cake is reslurried with a washing solvent in a separation and mixing device to achieve washing by dilution. Can be done. Dilution washing often requires multi-stage cake formation and subsequent reslurrying operated in a countercurrent manner.

  Step (g) optionally involves contacting the post-catalyst composition (200) with the concentrate feed (220) in the enrichment zone (210) to produce a consumable concentrate stream (220) and a concentrate composition (240). Wherein the concentrated composition (240) comprises isophthalic acid, phthalic acid, trimellitic acid, hydroxymethylbenzoic acid isomer, hydroxybenzoic acid isomer, benzoic acid, and toluic acid isomer One or more compounds selected from the group are included, wherein at least one of the compounds is concentrated higher than the concentration of the composition (200) after catalyst removal. In another embodiment of the present invention, the concentrated composition (240) comprises isophthalic acid, phthalic acid, trimellitic acid, benzoic acid, 4-hydroxybenzoic acid, 4-hydroxymethylbenzoic acid, 4,4′- Dicarboxybiphenyl, 2,6-dicarboxyanthraquinone, 4,4′-dicarboxystilbene, 2,5,4′-tricarboxybiphenyl, 2,5,4′-tricarboxybenzophenone, 4,4′-dicarboxy The group consisting of benzophenone, 4,4′-dicarboxybenzyl, formacetohydroxybenzoic acid, acetohydroxymethylbenzoic acid, α-bromo-p-toluic acid, bromobenzoic acid, bromoacetic acid, p-tolualdehyde, and terephthalaldehyde One or more compounds selected from:

  The term “enriched” means that the main outlet stream leaving the concentration zone or zones, or any zone, or any conduit as translated herein, Means having a higher concentration of any concentrated compound than the main inlet stream entering the zone or zones, wherein the concentrated compound is terephthalic acid, isophthalic acid, phthalic acid, benzenetricarboxylic acid Acid isomer, benzoic acid, hydroxybenzoic acid isomer, hydroxymethylbenzoic acid isomer, dicarboxybiphenyl isomer, dicarboxystilbene isomer, tricarboxybiphenyl isomer, tricarboxybenzophenone isomer, dicarboxybenzophenone isomer, Dicarboxybenzyl isomer, formacetohydroxybenzoic acid At least one compound selected from the group consisting of an isomer, an acetohydroxymethylbenzoic acid isomer, an α-bromo-toluic acid isomer, a bromobenzoic acid, a bromoacetic acid, a tolualdehyde isomer, and a phthalaldehyde isomer Contains compounds. In other aspects of the invention, the concentrated compound or concentrated feed (220) may comprise any compound, or combination thereof, useful for making monomers, comonomers, additives, or polyesters. For example, in the embodiment of the invention shown in FIGS. 1a and 1b, the main (primary) outlet stream is the concentrated composition (240) and the main (primary) inlet stream is the post-catalyst composition. (200). In the embodiment of the invention shown in FIG. 9, the primary inlet stream is a carboxylic acid composition (214) or a crystallization slurry composition (160), and the primary outlet stream is a concentrated carboxylic acid stream (280). It is. In the embodiment of the invention shown in FIG. 10, the primary inlet stream is a carboxylic acid composition (214) and the primary outlet stream is a concentrated carboxylic acid composition (216).

  In another aspect of the invention, the term “concentration” refers to at least 5 ppmw, or at least 10 ppmw, or at least 100 ppmw, or at least 1000 ppmw, or at least, rather than the primary inlet stream, when measured below all on a dry solid basis. 5 wt%, or at least 10 wt%, or at least 25 wt%, or at least 30 wt%, or at least 50 wt% higher concentration of any of the selected compounds described above.

  Concentrated feed (220) is terephthalic acid, isophthalic acid, phthalic acid, benzenetricarboxylic acid isomer, benzoic acid, hydroxybenzoic acid isomer, hydroxymethylbenzoic acid isomer, dicarboxybiphenyl isomer, dicarboxystilbene isomer , Tricarboxybiphenyl isomer, tricarboxybenzophenone isomer, dicarboxybenzophenone isomer, dicarboxybenzyl isomer, formacetohydroxybenzoic acid isomer, acetohydroxymethylbenzoic acid isomer, α-bromo-toluic acid isomer, Contains sufficient compound to concentrate with at least one compound selected from the group consisting of bromobenzoic acid, bromoacetic acid, tolualdehyde isomer, benzyl alcohol isomer, methylbenzyl alcohol isomer, and phthalaldehyde isomerIn other aspects of the invention, the concentrate feed (220) may also include any compound, or any combination thereof, useful for making a monomer, comonomer, additive, or polyester. In another aspect of the invention, the concentrated compound or concentrated feed (220) comprises one or more compounds selected from the group consisting of fluorene isomers, diphenylmethane isomers, diphenylethane isomers, and saturated aromatic isomers. Including. Examples of saturated aromatic isomers include, but are not limited to, cyclohexanecarboxylic acid and 1,4-cyclohexanedicarboxylic acid.

  In another aspect of the invention, the concentrate feed (220) is on a dry solid basis such that the concentrate composition (240) comprises the same composition as the dry carboxylic acid composition (280) described below. , Containing sufficient compound to concentrate the catalyst removal composition (200) shown in FIG. A special limitation other than the requirement that the concentrated feed (220) contains sufficient compounds to concentrate the post-catalyst composition (200) with the previously specified concentrated compound is the concentrated feed (220). It is not in the condition of. For example, the concentrated feed (220) can be, but is not limited to, a cake, powder, solid, cleaning fluid feed, slurry, solution, paste, or gas entrained solid or liquid.

  It should be pointed out that the concentrated feed (220) does not necessarily have to be introduced into the concentrated zone (210). As shown in FIG. 8, the concentrated feed (220) includes, but is not limited to, a concentration zone (210), a dewatering zone (250), and a drying zone (270). Or in the polyester process, or more particularly in the PET process. Various polyester processes have been developed. Initial efforts were by reactive distillation as disclosed in US Pat. No. 2,905,707, and ethylene glycol (“EG”) vapor as a reactant as disclosed in US Pat. No. 2,829,153 to make PET. Reactive distillation is used: both of these patents are incorporated herein by reference to the extent they do not conflict with the statements herein. As disclosed in U.S. Pat.No. 4,110,316, a plurality of stirred pots have been identified for obtaining additional control of the reaction, and this patent is incorporated herein to the extent that it does not conflict with the statements herein. Incorporated as a reference. US Pat. No. 3,054,776 discloses the use of less pressure drop between reactors in a PET process, whereas US Pat. No. 3,385,881 discloses multiple reactor stages within a single reactor shell. Both of these patents are hereby incorporated by reference to the extent that they are consistent with the statements herein. These designs are disclosed in US Pat. Nos. 3,118,843; 3,582,244; 3,600,137; 3,644,096; 3,689,461; 3,819,585; 4,235,844; 4,230,818; and 4,289,895. Improved to solve problems such as entrainment or entrainment or blockage, heat integration, heat transfer, reaction time, number of reactors, etc .; all these patents are described herein Incorporated herein by reference to the extent not inconsistent.

  In the PET process (400) shown in FIG. 8, the concentrated feed (220) can be introduced at a paste tank, esterification reactor, and / or other locations in the process. The concentrated feed (220) can be introduced either at a plurality of locations or at a single location, either at once or gradually over time.

  The raw materials for the production of sequentially grown polymers and copolymers from terephthalic acid (TPA) include monomers and comonomers, catalyst (s), and additives. Monomers and comonomers include, but are not limited to, diamines, diols, diacids, and the like. Important commercially available sequential polymers that can be produced using TPA as a monomer or comonomer are polyamides, polyesters, essentially poly (ethylene terephthalate) (PET), co-polyamides, co-polyesters, and co-polyesters -Including amide. It is advantageous that monomer or comonomer, catalyst (s) and / or additives are introduced to achieve their intimate mixing with terephthalic acid so that they do not have to be added to the polymerization process separately from TPA It is. A process has been invented that allows the production of terephthalic acid in the form of a powder, paste, wet cake, or slurry, and in which certain monomers or comonomers, catalyst (s) and / or additives are concentrated. This process is realized by intimate mixing with TPA to eliminate the need for individual addition of materials in the PET manufacturing process.

  The following description is given with respect to PET, but can be extended in a straightforward manner to other sequentially grown polymers and copolymers made using TPA. The manufacture of PET involves the high molecular weight sufficient for esterification of terephthalic acid with ethylene glycol, prepolymer formation, and intended subsequent polymer processing and applications that may include coatings, fibers, films, containers, and other products. Involved in polycondensation to form PET. Certain monomers or comonomers, catalyst (s) and / or additives can also be used. The most common comonomers other than ethylene glycol (EG) are isophthalic acid (IPA or PIA) and cyclohexanedimethanol (CHDM). The most common catalysts in PET production are antimony and titanium. Useful additives for PET production include phosphorus compounds, dyes, pigments, colorants, reheat materials, polydispersity modifiers, antioxidants and stabilizers (heat, oxidation, UV, etc.), coupling agents or chains. Extenders, end-capping agents, telechelic modifiers, such as metal coordinated sulfo-isophthalic acid, acetaldehyde reducing agents, acetaldehyde scavengers, buffers, substances that reduce the formation of diethylene glycol (DEG), antistatic agents Including, but not limited to, slip agents or anti-blocking agents, barrier modifiers, nucleating agents, titanium dioxide and other fillers / milky agents, antifogging agents, fluorescent whitening agents, etc. is not. The introduction of such comonomer, catalyst (s), and / or additives at various points in the PET manufacturing process is typically separate from the addition of TPA. However, it may be advantageous to introduce certain additives, in particular comonomers such as thermally stable isophthalic acid and dyes or colorants, together with TPA, ie before the PET manufacturing process. Thus, during the TPA manufacturing process rather than during the PET manufacturing process, the comonomer, catalyst (s), and additives can be introduced and mixed intimately with the TPA. A specific TPA production process in which homogeneous introduction of the additive (s) can be realized is on a solid-liquid separator for isolating the TPA cake, on any dryer, or on any transport line or process pipeline or Includes additions in them and before shipment of the TPA product in any container. Thus, dry solids (with residual water or acetic acid), wet cake (with some liquid water, or methanol, or EG, or some other diol or comonomer, or mixture), wet paste (with some liquid Water, or methanol, or EG, or some other diol or comonomer, or mixture), or slurry (with water, or methanol, or EG, or some other diol or comonomer, or mixture) Regardless, any form of TPA product can be concentrated prior to use in PET manufacture.

  In addition, FIG. 9 shows that concentration feedstock (220) is introduced and that concentration occurs at any point from the crystallized slurry composition (160) to the dry carboxylic acid composition (280). Yes.

  Another embodiment of the present invention is presented in FIG. This concentration process may be performed on the carboxylic acid composition (214) in the extended concentration zone (213) to produce a concentrated carboxylic acid composition (216). The concentrated feed (220) can contain any composition previously or subsequently revealed. The carboxylic acid composition (214) has no restrictions with respect to the carboxylic acid composition except that it contains a carboxylic acid, optionally a solvent, and optionally a catalyst. In another aspect of the invention, a carboxylic acid composition can be used to produce a dry carboxylic acid composition (280).

  In another embodiment of the invention, the enrichment zone (210) and the catalyst removal zone (180) are combined into one zone with at least one device performing both functions as shown in FIG. It must also be pointed out that it can.

  There are no particular restrictions on the concentrated feed (220) except having a composition suitable for the concentration of the composition (200) after catalyst removal. For example, the concentrated feed (220) can be a solid, a cleaning liquid, a slurry, a paste, solids, a solution, or a liquid or solid mixed with gas. In an embodiment of the invention, the concentrated feed (220) contains a composition capable of making a dry carboxylic cake composition (280). In another aspect of the invention, the concentrated feed (220) is a single solid that is added at one time or throughout the process to produce a dry carboxylic cake composition (280). .

  FIGS. 12, 13, 14 and 15 illustrate one embodiment of the present invention showing how a concentrated feed (220) can be obtained and how the concentrated feed (220) is utilized throughout the process. Yes. In FIGS. 12, 13, 14, and 15, the concentrated feed (s) is shown as stream (220). This is because concentrated feed (s) (220) can be obtained from different sources or from one source, and concentrated feed (s) can be obtained from a variety of different compositions, different physical shapes and processes. It can be shown that it can have different time points of addition. The concentrated feed (220) can also be added at once, intermittently or gradually throughout the process.

  FIG. 15 illustrates one embodiment of the present invention of a method by which a concentrated feed (220) can be obtained. At least a portion of the catalyst enriched liquid (185) is fed to the cooling and / or concentration zone (300), resulting in a concentrated mother liquor stream (310) and solvent stream (311). Sufficient solvent removal in the cooling and / or concentration zone (300) realizes that the concentrated catalyst-rich stream (310) has a solid fraction in the range of 10 wt% to 45 wt%.

  A portion of the concentrated mother liquor stream (310) and extraction solvent stream (323) is fed to the extraction zone (320), resulting in a catalyst rich stream (324) and a catalyst depleted stream 350. A concentrated balance of mother liquor stream (310) and wash stream (331) is fed to a solid-liquid separation zone (SLS zone) and wet cake stream (340) and wash liquid stream comprising mother liquor and wash liquid ( 332). The wet cake stream (340) is used as a concentrated feed (220), and a portion of the wet cake stream (340) is sent to a product filter or product dryer, the contents of the wet cake stream (340). The product stream with at least a portion of is concentrated. Alternatively, a portion of the wet cake stream (340) and a portion of the catalyst depleted stream (350) are fed to any mixing zone where the two streams are mixed to form a concentrated feed (220); And a portion of this stream is sent to a product filter or product dryer to concentrate the product stream with at least a portion of the contents of the concentrated feed (220).

  The extraction zone (320) comprises at least one extractor. The extraction solvent (323) used in the extractor must be substantially insoluble in water in order to minimize the amount of organic solvent dissolved in the aqueous fraction. In addition, the extraction solvent (323) is preferably an azeotrope that helps to recover the solvent from the organic extract. Solvents that have proven to be partially useful are C1-C6 alkyl acetates, especially n-propyl acetate (n-PA), isopropyl acetate, isobutyl acetate, sec-butyl acetate, ethyl acetate and n-butyl acetate. However, other water insoluble organic solvents having a suitable density and a sufficiently low boiling point, such as p-xylene, can also be used. n-Propyl acetate and isopropyl acetate are especially preferred because of their relatively low water solubility, excellent azeotropic behavior, and their ability to remove high boiling organic impurities in addition to residual acetic acid from their aqueous mixtures. preferable.

  Extraction can be performed using a solvent ratio of about 1 to about 4 parts by weight of solvent per part of extractor feed, depending on the feed composition of the extractor. The space velocity of the combined feed to the extractor is generally in the range of 1 to about 3 / hour. Extraction can be carried out at ambient temperature and pressure, but heating of the solvent and extractor from about 30 ° C. to about 70 ° C., or from about 40 ° C. to about 60 ° C. can be used.

  FIGS. 12, 13, and 14 illustrate one embodiment of the present invention of the manner in which the concentrated feed (220) is utilized throughout this process. Aromatic feed stock (10) containing reactants and catalyst is fed to primary oxidation zone (20) to produce crude carboxylic acid composition (30). The crude carboxylic acid composition (30) and the solvent stream (50) are fed to the liquid exchange zone (40) and a partial solvent removal that exchanges a portion of the oxidizing solvent present in the stream (30) with pure solvent. The replacement is realized, resulting in a displaced solvent stream (60) and slurry composition stream (70). The slurry composition (70) and the oxygenated gas stream (106) are fed to a staged oxidation zone (80) to produce a staged oxidation composition (110). This staged oxidation composition (110) and solvent stream (101) are fed to the liquid exchange zone (100) to exchange a portion of the oxidation solvent present in the staged oxidation composition (110) with pure solvent. Partial solvent exchange is achieved, resulting in a displaced solvent stream (102) and a post-solvent exchange staged oxidation composition (115). The post-solvent exchange staged oxidation composition (115) is fed to the crystallization zone (120) and crystallized slurry composition stream (160), optional solvent vapor stream (121), and optional liquid solvent stream. (122) is generated. The crystallized slurry composition stream (160) and optional concentrated feed (220) are fed to a cooling zone (165) where the cooled carboxylic acid composition stream (170) and optional oxidizing solvent stream (163). Is generated. The cooled carboxylic acid composition (170), wash feed (175), and optional concentrated feed (220) are fed to the catalyst removal zone (180), after the catalyst removal composition (200), catalyst rich. The crystallization liquid (185) and the cleaning liquid (62), and the depleted concentrated feed (230) are produced. The post-catalyst composition (200), replacement solvent stream (201), and optional concentrated feed (220) are fed to optional solvent replacement zone (205), replacement solvent liquid (202), and A post solvent replacement composition (206) is produced. The post-solvent replacement composition (206) and concentrated feed (220) are fed to the concentration zone (210), resulting in a concentrated carboxylic acid composition stream (240) and a depleted concentrated feed (230). Concentrated composition (240) and optional concentrated feed (220) are fed to optional dewatering zone (250), resulting in dehydrated carboxylic acid composition (260).

  The catalyst removal zone (180), solvent replacement zone (205), concentration zone (210), dehydration zone (250), and optionally drying zone (270) are a single solid-liquid separation device, preferably continuous pressure or vacuum. It can be realized in a filter, most preferably in a vacuum belt filter. A continuous pressure drum filter or a rotating vacuum drum filter can also be used. The dehydrated and concentrated carboxylic acid composition (260), and optionally the concentrated feed (220), is fed to an optional drying zone (270) and dried and concentrated to the carboxylic acid composition (280) and solvent vapor. A flow (275) is produced.

  In another embodiment of the invention, the concentrated feed (220) contains an amount of water greater than 50% by weight. In another aspect of the invention, the concentrated feed (220) contains an amount of water greater than 75% by weight. In another aspect of the invention, the concentrated feed (220) contains an amount of water greater than 95% by weight. In another embodiment of the invention, the concentrated feed (220) contains an amount of water greater than 99% by weight.

  In another embodiment of the invention, the post-catalyst composition (200) enters the concentration zone (210) at a temperature ranging from about 200 ° C. to the freezing point of the concentrated feed (220). In another embodiment of the invention, the post-catalyst composition (200) enters the concentration zone (210) at a temperature ranging from about 100 ° C. to the freezing point of the concentrated feed (220). In another embodiment of the invention, the post-catalyst composition (200) enters the concentration zone (210) at a temperature in the range of about (200) ° C. to about 0 ° C. In another embodiment of the present invention, the post catalyst removal composition (200) enters the concentration zone (210) at a temperature in the range of about 0 ° C to about 100 ° C. Another range is less than 100 ° C to 20 ° C; and 40 ° C to less than 100 ° C.

  The concentration zone (210) is at least one compound selected from the group consisting of benzoic acid, isophthalic acid, phthalic acid, trimellitic acid, hydroxybenzoic acid isomer, hydroxymethylbenzoic acid isomer, and toluic acid isomer. At least one device that is sufficient to provide a contact time between the concentrated feed (220) and the post-catalyst removal composition (200) sufficient to be concentrated. In another aspect of the invention, the concentration zone (210) or expanded concentration zone (213) is sufficient to concentrate monomers, comonomers, additives, and other compounds useful in the production of polyesters. An apparatus is provided for providing contact time between the concentrated feed and the post-catalyst composition (200) or carboxylic acid composition (214). In another embodiment of the present invention, the enrichment zone (210) or expanded enrichment zone (213) is a solid filter, such as a belt filter, pressure filter, rotary pressure filter, perforated basket centrifuge, disc stack centrifuge, and the like. And / or at least one device selected from the group consisting of centrifuges capable of adding wash streams.

In another aspect of the invention, the dry solids based concentrated composition (240) is a combination of all possible compositions of the dry carboxylic acid composition (280) described subsequently in this disclosure. Is included. The dry solids criteria will continue to be described in this disclosure.
All compositions are measured on a dry solids basis as subsequently described in this disclosure. The ppm in all measurements and claims is mass ppm based on dry solids basis.

Step (h) includes optional dehydration in the dehydration zone (250) of the concentrated composition (240) to form a dehydrated post catalyst removal composition (260).
Dehydration can be performed by any means known in the art. Dehydration results in a dehydrated post-catalyst composition (260) having a moisture content of less than 25% by weight moisture. Other moisture ranges are from less than 15% moisture to less than 10% moisture or less than 5% moisture. In yet another aspect of the present invention, dehydration can be accomplished largely through the use of drying machine means, where the majority of drying is not accomplished by evaporation. As used herein, the majority means more than 50%.

Step (i) removes a portion of the solvent from the concentrated composition (240) or dehydrated catalyst removal composition (260) to produce a dried carboxylic acid composition (280). Filtration and filtration and optionally drying of the concentrated composition (240) in the filtration and drying zone (270) or after dehydrated catalyst removal (260).
Concentrated composition (240) or dehydrated post catalyst removal composition (260) is removed from concentration zone (210) or dehydration zone (250) and fed to filtration and drying zone (270).

In one embodiment of the present invention, the filter cake proceeds through an initial solvent removal step and then rinsed with an acid wash to remove residual catalyst, after which the solvent is removed again and then sent to the dryer.
The drying zone (270) comprises at least one dryer and is capable of evaporating at least 10% of the remaining volatiles in the filter cake to produce a dried carboxylic acid composition (280). It can be realized by any means known in the art. For example, an indirect contact dryer including a rotary steam tube dryer, a Single Shaft Porcupine® Processor dryer, and a Bepex Solidaire® Processor is used for drying and the dried carboxylic acid composition (280 ) Can be generated. Direct contact dryers, including fluidized bed dryers and drying in conveyor lines, can be used for drying to produce a dry carboxylic acid composition (280). In another embodiment of the present invention, drying is accomplished in a solid-liquid separation device, such as a vacuum belt filter or a rotary pressure drum filter, that allows a gas stream to flow through the filter cake and consequently remove volatiles. can do. In another aspect of the present invention, the solid-liquid separator can comprise a combination of the following zones: catalyst removal zone, concentration zone, dehydration zone, and drying zone. The dry carboxylic acid composition is a carboxylic acid composition with a moisture content of less than 5%, preferably less than 2% moisture, more preferably less than 1% moisture, even more preferably less than 0.5%, still more preferably less than 0.1%. Can be.

  In an embodiment of the invention, the dried carboxylic acid composition (280) has a b * of less than about 9.0. In another embodiment of the present invention, the b * color of the dried carboxylic acid composition (280) is less than about 6.0. In another embodiment of the invention, the dried carboxylic acid composition (280) has a b * color of less than about 5.0. In another embodiment of the present invention, the dried carboxylic acid composition (280) has a b * color of less than about 4.0. In another embodiment of the present invention, the dried carboxylic acid composition (280) has a b * color of less than about 4.0. In another embodiment of the present invention, the dried carboxylic acid composition (280) has a b * color of less than about 3. The b * color is one of the three-color attributes measured with a spectroscopic reflectance-based instrument. The Hunter Ultrascan XE instrument in reflection mode is typical of a measuring device. A positive reading means yellowness (or blue absorbance) and a negative reading means blueness (or yellow absorbance).

Composition containing at least one carboxylic acid
I. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) The carboxylic acid is more than 50% by weight, or more than 60% by weight, or more than 70% by weight, or more than 80% by weight, or more than 90% by weight, or 95% by weight. Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight;
And optionally,
(2) (a) carboxybenzaldehyde (CBA) isomer in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) toluic acid (TA) isomer in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(i) a carboxybenzaldehyde isomer in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
(ii) toluic acid isomers in amounts ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Wherein the total concentration of carboxybenzaldehyde and toluic acid isomers is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) at least one, or at least 2, or at least 3, or at least 4, or at least 5, or at least 6, or at least 7, or at least 8, or at least 9, or at least: At least 10, or at least 11, or at least 12, or at least 13, or at least 14, or at least 15, or at least 16, or at least 17, or at least 18, or at least 19, or At least 20 or all:
(a) terephthalic acid in an amount of at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm;
(b) an amount of isophthalic acid in an amount of at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm;
(c) phthalic acid in an amount of at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or in the range of 20 ppm to 1000 ppm, or in the range of 50 ppm to 750 ppm, or in the range of 100 ppm to 500 ppm;
(d) benzene-tricarboxylic acid isomers in an amount of at least 125 ppm, or in the range of 125 ppm to 1000 ppm, or in the range of 150 ppm to 750 ppm, or in the range of 175 ppm to 500 ppm;
(e) benzoic acid in an amount of at least 50 ppm, or at least 75 ppm, or at least 100 ppm; or in the range of 50 ppm to 500 ppm, or in the range of 75 ppm to 400 ppm, or in the range of 100 ppm to 300 ppm;
(f) an amount of hydroxybenzoic acid isomer in an amount of at least 3 ppm, at least 5 ppm, or at least 20 ppm, or in the range of 3 ppm to 200 ppm, or in the range of 5 ppm to 175 ppm, or in the range of 20 ppm to 150 ppm;
(g) an amount of hydroxymethylbenzoic acid isomer in an amount of at least 40 ppm, or at least 80 ppm, or at least 100 ppm, or in the range of 40 ppm to 200 ppm, or in the range of 80 ppm to 180, or in the range of 100 ppm to 160 ppm;
(h) an amount of dicarboxybiphenyl isomer in the range of 20 ppm to 150 ppm, or in the range of 25 ppm to 100 ppm, or in the range of 25 ppm to 75 ppm;
(i) an amount of dicarboxystilbene isomer greater than 7 ppm; or in a range greater than 10 ppm;
(j) a tricarboxybiphenyl isomer in an amount in the range of 8 ppm to 100 ppm, or in the range of 9 ppm to 50 ppm, or in the range of 10 ppm to 25 ppm;
(k) an amount of tricarboxybenzophenone isomer in the range of 5 ppm to 100 ppm, or in the range of 6 ppm to 75 ppm, or in the range of 7 ppm to 60 ppm;
(l) an amount of dicarboxybenzophenone isomer in the range of 10 ppm to 150 ppm, or in the range of 12 ppm to 100 ppm, or in the range of 15 ppm to 75 ppm;
(m) an amount of dicarboxybenzyl isomer in the range of 1 ppm to 30 ppm, or in the range of 2 ppm to 20 ppm, or in the range of 3 ppm to 10 ppm;
(n) form-aceto-hydroxybenzoic acid isomer in an amount ranging from 1 ppm to 20 ppm, or ranging from 2 ppm to 15 ppm, or ranging from 3 ppm to 10 ppm;
(o) an aceto-hydroxymethylbenzoic acid isomer in an amount in the range of 1 ppm to 30 ppm, or in the range of 2 ppm to 20 ppm, or in the range of 3 ppm to 15 ppm;
(p) a-bromo-toluic acid isomer in an amount ranging from 1 ppm to 100 ppm, or ranging from 2 ppm to 50 ppm, or ranging from 5 ppm to 25 ppm;
(q) Bromo-benzoic acid in an amount ranging from 5 ppm to 50 ppm, or ranging from 10 ppm to 40 ppm, or ranging from 15 ppm to 35 ppm;
(r) bromo-acetic acid in an amount ranging from 1 ppm to 10 ppm;
(s) Tolualdehyde isomers in amounts ranging from 7 ppm to 50 ppm, or from 8 ppm to 25 ppm, or from 9 ppm to 20 ppm;
(t) phthalaldehyde isomer in an amount in the range of 0.25 ppm to 10 ppm, or in the range of 0.5 ppm to 5 ppm, or in the range of 0.75 ppm to 2 ppm; wherein one or more compounds selected in (3) Is different from one or more compounds selected in (1) and (2);
And optionally,
(4) At least one, or at least 2, or at least 3, or at least 4, or at least 5, or at least 6, or at least 7, or at least 8, or all of the following:
(a) terephthalic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 5000 ppm, or in the range of 5 ppm to 2500 ppm, or in the range of 10 ppm to 2000 ppm, or in the range of 15 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(b) an amount of isophthalic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 5000 ppm, or in the range of 5 ppm to 2500 ppm, or in the range of 10 ppm to 2000 ppm, or in the range of 15 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(c) phthalic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 3000 ppm, or in the range of 2 ppm to 2000 ppm, or in the range of 3 ppm to 1000 ppm, or in the range of 4 ppm to 500 ppm;
(d) benzene-tricarboxylic acid isomers in an amount of at least 1 ppm, or in the range of 1 ppm to 3000 ppm, or in the range of 5 ppm to 2000 ppm, or in the range of 10 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(e) benzoic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 3000 ppm, or in the range of 5 ppm to 2000 ppm, or in the range of 10 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(f) an amount of hydroxybenzoic acid isomer in an amount of at least 1 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 5 ppm to 400 ppm, or in the range of 10 ppm to 200 ppm;
(g) an amount of hydroxymethylbenzoic acid isomer at least 1 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 5 ppm to 400 ppm, or in the range of 10 ppm to 200 ppm;
(h) an amount of dicarboxybiphenyl isomer at least 1 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 5 ppm to 400 ppm, or in the range of 10 ppm to 200 ppm;
Here, the one or more compounds selected in (4) are different from the one or more compounds selected in (3).

II. In another embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) Carboxybenzaldehyde isomer (CBA) in an amount in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) Toluic acid isomer (TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least 2, or at least 3, or at least 4, or at least 5, or at least 6, or 7 or all of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or (10) wt%, or 25wt%, or 49wt%, or 500ppm, or An amount ranging from 1000 ppm to 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range of 140 ppm to 1000 ppm, or in the range of 175 ppm to 750 ppm, or in the range of 200 ppm to 500 ppm, or in the range of 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) dicarboxybiphenyl isomer in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or (10) wt%, or 25 wt%, or 49 wt%;
(d) at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or in the range of 20 ppm to 1000 ppm, or in the range of 50 ppm to 750 ppm, or in the range of 100 ppm to 500 ppm, or in the range of 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(e) hydroxybenzoic acid isomers in the range of 3 ppm to 200 ppm, or 5 ppm to 175 ppm, or 20 ppm to 150 ppm, or 3 ppm, or 5 ppm, or 20 ppm to 150 ppm, or 175 ppm, or 200 ppm, or 500 ppm; Or in the range of 1000 ppm;
(f) hydroxymethylbenzoic acid isomers at least 40 ppm, or at least 80 ppm, or at least 100 ppm, or in the range of 40 ppm to 200 ppm, or in the range of 80 ppm to 180 ppm, or in the range of 100 ppm to 160 ppm, or 40 ppm, or 80 ppm, or An amount ranging from 100 ppm to 500 ppm, or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(g) Benzoic acid in the range of 60 ppm to 500 ppm, or 75 ppm to 400 ppm, or 100 ppm to 300 ppm, or 60 ppm, or 75 ppm, or 100 ppm to 300 ppm, or 500 ppm, or 1000 ppm;
(h) terephthalic acid, at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or 20 ppm to 1000 ppm, or 50 ppm to 750 ppm, or 100 ppm to 500 ppm, or 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm -2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%.

III. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) Toluic acid isomer (TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least 2 or at least 3 or at least 4 or at least 5 or all of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) dicarboxybiphenyl isomer in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(d) at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or 20 ppm to 1000 ppm, or 50 ppm to 750 ppm, or 100 ppm to 500 ppm, or 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm. , Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(e) benzoic acid in the range of 60 ppm to 500 ppm, or in the range of 75 ppm to 400 ppm, or in the range of 100 ppm to 300 ppm, or in the range of 60 ppm, or 75 ppm, or 100 ppm to 300 ppm, or 500 ppm, or 1000 ppm;
(f) terephthalic acid, at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or 20 ppm to 1000 ppm, or 50 ppm to 750 ppm, or 100 ppm to 500 ppm, or 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm; , Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;

IV. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) an amount of toluic acid isomer (TA) in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least 2 or at least 3 or at least 4 or all of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500 ppm, or 1000 ppm, or 2000 ppm, or 0.5 wt%, 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) dicarboxybiphenyl isomer in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(d) at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or 20 ppm to 1000 ppm, or 50 ppm to 750 ppm, or 100 ppm to 500 ppm, or 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm. , Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(e) terephthalic acid at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or 20 ppm to 1000 ppm, or 50 ppm to 750 ppm, or 100 ppm to 500 ppm, or 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm , Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;

V. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) Carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) Toluic acid isomer (TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least two, or at least three, or all of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) dicarboxybiphenyl isomer in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(d) terephthalic acid, at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;

VI. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) Carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) an amount of toluic acid isomer (TA) in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least two or all of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) dicarboxybiphenyl isomer in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;

VII. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) Carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) Toluic acid isomer (TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;

VIII. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) an amount of toluic acid isomer (TA) in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) dicarboxybiphenyl isomer in the range 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;

IX. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) an amount of toluic acid isomer (TA) in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) a benzene-tricarboxylic acid isomer in the range of 140 ppm to 1000 ppm, or in the range of 175 ppm to 750 ppm, or in the range of 200 ppm to 500 ppm, or in the range of 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(b) dicarboxybiphenyl isomer in the range 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;

X. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) Carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) an amount of toluic acid isomer (TA) in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least two or all of the following:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) dicarboxybiphenyl isomer in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;

XI. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) Carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) an amount of toluic acid isomer (TA) in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;

XII. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) (a) carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) an amount of toluic acid isomer (TA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of carboxybenzaldehyde isomer (CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) an amount of toluic acid isomer (TA) in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
Where the total concentration of CBA and TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) dicarboxybiphenyl isomer in the range 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;

XIII. In another embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of carboxylic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by weight; and
(2) Carboxybenzaldehyde isomer (CBA) in an amount ranging from 1 ppm to 500 ppm, and
(3) All of the following:
(a) at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or 50 ppm, or 75 ppm, or 100 ppm, or 150ppm to 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm or 1000ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) dicarboxybiphenyl isomer in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt%, or An amount in the range of 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;

Isophthalic acid composition
I. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of isophthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 3-carboxybenzaldehyde (3-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) m-toluic acid (m-TA isomer) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) An amount of 3-carboxybenzaldehyde (3-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) m-toluic acid isomer (m-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 3-CBA and m-TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) at least one, or at least 2, or at least 3, or at least 4, or at least 5, or at least 6, or at least 7, or at least 8, or at least 9, or at least: At least 10, or at least 11, or at least 12, or at least 13, or at least 14, or at least 15, or at least 16, or at least 17, or at least 18, or at least 19, or all:
(a) terephthalic acid in an amount of at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm;
(b) phthalic acid in an amount of at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or in the range of 20 ppm to 1000 ppm, or in the range of 50 ppm to 750 ppm, or in the range of 100 ppm to 500 ppm;
(c) a benzene-tricarboxylic acid isomer at least 140 ppm, or in the range of 140 ppm to 1000 ppm, or in the range of 175 ppm to 750 ppm, or in the range of 200 ppm to 500 ppm;
(d) benzoic acid in an amount of at least 50 ppm, or at least 75 ppm, or at least 100 ppm; or in the range of 50 ppm to 500 ppm, or in the range of 75 ppm to 400 ppm, or in the range of 100 ppm to 300 ppm;
(e) 3-hydroxybenzoic acid in an amount of at least 3 ppm, at least 5 ppm, or at least 20 ppm, or in the range of 3 ppm to 200 ppm, or in the range of 5 ppm to 175 ppm, or in the range of 20 ppm to 150 ppm;
(f) 3-hydroxymethylbenzoic acid in an amount of at least 40 ppm, or at least 80 ppm, or at least 100 ppm, or in the range of 40 ppm to 200 ppm, or in the range of 80 ppm to 180, or in the range of 100 ppm to 160 ppm;
(g) 3,3′-dicarboxybiphenyl isomer in an amount in the range of 20 ppm to 150 ppm, or in the range of 25 ppm to 100 ppm, or in the range of 25 ppm to 75 ppm;
(h) an amount of dicarboxyanthraquinone isomer less than 1 ppm, or less than 0.5 ppm, or less than 0.4 ppm, or less than 0.35 ppm;
(i) an amount of dicarboxystilbene isomer greater than 7 ppm; or in a range greater than 10 ppm;
(j) an amount of tricarboxybiphenyl isomer in the range of 8 ppm to 100 ppm, or in the range of 9 ppm to 50 ppm, or in the range of 10 ppm to 25 ppm;
(k) an amount of tricarboxybenzophenone isomer in the range of 5 ppm to 100 ppm, or in the range of 6 ppm to 75 ppm, or in the range of 7 ppm to 60 ppm;
(l) an amount of dicarboxybenzophenone isomer in the range of 10 ppm to 150 ppm, or in the range of 12 ppm to 100 ppm, or in the range of 15 ppm to 75 ppm;
(m) dicarboxybenzyl isomer in an amount ranging from 1 ppm to 30 ppm, or ranging from 2 ppm to 20 ppm, or ranging from 3 ppm to 10 ppm;
(n) form-aceto-hydroxybenzoic acid isomer in an amount ranging from 1 ppm to 20 ppm, or ranging from 2 ppm to 15 ppm, or ranging from 3 ppm to 10 ppm;
(o) an aceto-hydroxymethylbenzoic acid isomer in an amount in the range of 1 ppm to 30 ppm, or in the range of 2 ppm to 20 ppm, or in the range of 3 ppm to 15 ppm;
(p) a-bromo-m-toluic acid isomer in an amount ranging from 1 ppm to 100 ppm, or ranging from 2 ppm to 50 ppm, or ranging from 5 ppm to 25 ppm;
(q) Bromo-benzoic acid in an amount ranging from 5 ppm to 50 ppm, or ranging from 10 ppm to 40 ppm, or ranging from 15 ppm to 35 ppm;
(r) bromo-acetic acid in an amount ranging from 1 ppm to 10 ppm;
(s) an amount of m-tolualdehyde in the range of 7 to 50 ppm, or in the range of 8 to 25 ppm, or in the range of 9 to 20 ppm;
(t) an amount of isophthalaldehyde in the range of 0.25 ppm to 10 ppm, or 0.5 ppm to 5 ppm, or 0.75 ppm to 2 ppm; and optionally
(4) At least one, or at least 2, or at least 3, or at least 4, or at least 5, or at least 6, or at least 7 or all of the following:
(a) terephthalic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 5000 ppm, or in the range of 5 ppm to 2500 ppm, or in the range of 10 ppm to 2000 ppm, or in the range of 15 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(b) phthalic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 3000 ppm, or in the range of 2 ppm to 2000 ppm, or in the range of 3 ppm to 1000 ppm, or in the range of 4 ppm to 500 ppm;
(c) benzene-tricarboxylic acid isomers in an amount of at least 1 ppm, or in the range of 1 ppm to 3000 ppm, or in the range of 5 ppm to 2000 ppm, or in the range of 10 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(d) benzoic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 3000 ppm, or in the range of 5 ppm to 2000 ppm, or in the range of 10 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(e) 3-hydroxybenzoic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 5 ppm to 400 ppm, or in the range of 10 ppm to 200 ppm;
(f) 3-hydroxymethylbenzoic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 5 ppm to 400 ppm, or in the range of 10 ppm to 200 ppm;
(g) 3,3′-dicarboxybiphenyl in an amount of at least 1 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 5 ppm to 400 ppm, or in the range of 10 ppm to 200 ppm;
(h) an amount of dicarboxyanthraquinone isomer at least 0.1 ppm, or in the range of 0.1 ppm to 5 ppm, or in the range of 0.2 ppm to 4 ppm, or in the range of 0.3 ppm to 3 ppm;
Here, the one or more compounds selected in (4) are different from the one or more compounds selected in (3).

II. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of isophthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 3-carboxybenzaldehyde (3-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) An amount of 3-carboxybenzaldehyde (3-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 3-CBA and m-TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least 2 or at least 3 or at least 4 or at least 5 or at least 6 or all of the following:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) 3,3′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or an amount in the range of 49 wt%;
(d) phthalic acid, at least 20 ppm, or at least 50 ppm, or at least 100 ppm, in the range of 20 ppm to 1000 ppm, in the range of 50 ppm to 750 ppm, in the range of 100 ppm to 500 ppm, or in the range of 20 ppm, or 50 ppm, or 100 ppm to 500 ppm, or 750 ppm; Or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 750ppm, or 1000ppm 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(e) 3-hydroxybenzoic acid in the range of 3 ppm to 200 ppm, or 5 ppm to 175 ppm, or 20 ppm to 150 ppm, or 3 ppm, or 5 ppm, or 20 ppm to 150 ppm, or 175 ppm, or 200 ppm, or 500 ppm; Or in the range of 1000 ppm;
(f) 3-hydroxymethylbenzoic acid at least 40 ppm, or at least 80 ppm, or at least 100 ppm, or in the range of 40 ppm to 200 ppm, or in the range of 80 ppm to 180, or in the range of 100 ppm to 160 ppm, or 40 ppm, or 80 ppm, or An amount ranging from 100 ppm to 500 ppm, or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(g) Benzoic acid in the range of 60 ppm to 500 ppm, or 75 ppm to 400 ppm, or 100 ppm to 300 ppm, or 60 ppm, or 75 ppm, or 100 ppm to 300 ppm, or 500 ppm, or 1000 ppm.

III. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of isophthalic acid Greater than, or greater than 97%, or greater than 98%, greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 3-carboxybenzaldehyde (3-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) A quantity of 3-carboxybenzaldehyde (3-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 3-CBA and m-TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least 2 or at least 3 or at least 4 or all of the following:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) a benzene-tricarboxylic acid isomer, in the range of 140 ppm to 1000 ppm, or in the range of 175 ppm to 750 ppm, or in the range of 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) 3,3′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%.
(d) at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or 20 ppm to 1000 ppm, or 50 ppm to 750 ppm, or 100 ppm to 500 ppm, or 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm. , Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(e) Benzoic acid in the range of 60 ppm to 500 ppm, or 75 ppm to 400 ppm, or 100 ppm to 300 ppm, or 60 ppm, or 75 ppm, or 100 ppm to 300 ppm, or 500 ppm, or 1000 ppm.

IV. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of isophthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 3-carboxybenzaldehyde (3-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, ranging from 1 ppm to 250 ppm, ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) An amount of 3-carboxybenzaldehyde (3-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 3-CBA and m-TA ranges from 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least two, or at least three, or all of the following:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500 ppm, or 1000 ppm, or 2000 ppm, or 0.5 wt%, 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(b) a benzene-tricarboxylic acid isomer in the range of 140 ppm to 1000 ppm, or in the range of 175 ppm to 750 ppm, or in the range of 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) 3,3′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or an amount in the range of 49 wt%;
(d) at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or 20 ppm to 1000 ppm, or 50 ppm to 750 ppm, or 100 ppm to 500 ppm, or 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm. , Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm -2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%.

V. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of isophthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 3-carboxybenzaldehyde (3-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) An amount of 3-carboxybenzaldehyde (3-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 500 ppm, ranging from 1 ppm to 250 ppm, ranging from 1 ppm to 125 ppm;
Where the total concentration of 3-CBA and m-TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least two or all of the following:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) Benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm.
(c) 3,3′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%.

VI. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of isophthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 3-carboxybenzaldehyde (3-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) An amount of 3-carboxybenzaldehyde (3-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 3-CBA and m-TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;

VII. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of isophthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 3-carboxybenzaldehyde (3-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) An amount of 3-carboxybenzaldehyde (3-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 500 ppm, ranging from 1 ppm to 250 ppm, ranging from 1 ppm to 125 ppm;
Where the total concentration of 3-CBA and m-TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) 3,3′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or an amount in the range of 49 wt%;

VIII. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of isophthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 3-carboxybenzaldehyde (3-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) An amount of 3-carboxybenzaldehyde (3-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) m-toluic acid (m-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 3-CBA and m-TA is in the range of 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) a benzene-tricarboxylic acid isomer in the range of 140 ppm to 1000 ppm, or in the range of 175 ppm to 750 ppm, or in the range of 200 ppm to 500 ppm, or in the range of 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(b) 3,3′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%.

IX. In another embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of isophthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) 3-carboxybenzaldehyde (3-CBA) in an amount ranging from 1 ppm to 500 ppm, and
(3) All of the following:
(a) terephthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) benzene-tricarboxylic acid isomers in the range 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) 3,3′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%.

Terephthalic acid composition
I. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of terephthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 4-carboxybenzaldehyde (4-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of 4-carboxybenzaldehyde (4-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 4-CBA and p-TA ranges from 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) at least one, or at least 2, or at least 3, or at least 4, or at least 5, or at least 6, or at least 7, or at least 8, or at least 9, or at least: At least 10, or at least 11, or at least 12, or at least 13, or at least 14, or at least 15, or at least 16, or at least 17, or at least 18, or at least 19, or all:
(a) an amount of isophthalic acid in an amount of at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm;
(b) phthalic acid in an amount of at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or in the range of 20 ppm to 1000 ppm, or in the range of 50 ppm to 750 ppm, or in the range of 100 ppm to 500 ppm;
(c) trimellitic acid, at least 140 ppm, or in the range of 140 ppm to 1000 ppm, or in the range of 175 ppm to 750 ppm, or in the range of 200 ppm to 500 ppm;
(d) benzoic acid in an amount of at least 50 ppm, or at least 75 ppm, or at least 100 ppm; or in the range of 50 ppm to 500 ppm, or in the range of 75 ppm to 400 ppm, or in the range of 100 ppm to 300 ppm;
(e) 4-hydroxybenzoic acid in an amount of at least 3 ppm, at least 5 ppm, or at least 20 ppm, or in the range of 3 ppm to 200 ppm, or in the range of 5 ppm to 175 ppm, or in the range of 20 ppm to 150 ppm;
(f) 4-hydroxymethylbenzoic acid in an amount of at least 40 ppm, or at least 80 ppm, or at least 100 ppm, or in the range of 40 ppm to 200 ppm, or in the range of 80 ppm to 180, or in the range of 100 ppm to 160 ppm;
(g) 4,4′-dicarboxybiphenyl in an amount in the range of 20 ppm to 150 ppm, or in the range of 25 ppm to 100 ppm, or in the range of 25 ppm to 75 ppm;
(h) 2,6-dicarboxyanthraquinone in an amount less than 1 ppm, or less than 0.5 ppm, or less than 0.4 ppm, or less than 0.35 ppm;
(i) 4,4′-dicarboxystilbene in an amount greater than 7 ppm; or in the range greater than 10 ppm;
(j) 2,5,4′-tricarboxybiphenyl in an amount in the range of 8 ppm to 100 ppm, or in the range of 9 ppm to 50 ppm, or in the range of 10 ppm to 25 ppm;
(k) 2,5,4′-tricarboxybenzophenone in an amount in the range of 5 ppm to 100 ppm, or in the range of 6 ppm to 75 ppm, or in the range of 7 ppm to 60 ppm;
(l) 4,4′-dicarboxybenzophenone in an amount ranging from 10 ppm to 150 ppm, or ranging from 12 ppm to 100 ppm, or ranging from 15 ppm to 75 ppm;
(m) 4,4′-dicarboxybenzyl in an amount ranging from 1 ppm to 30 ppm, or ranging from 2 ppm to 20 ppm, or ranging from 3 ppm to 10 ppm;
(n) form-aceto-hydroxybenzoic acid in an amount ranging from 1 ppm to 20 ppm, or ranging from 2 ppm to 15 ppm, or ranging from 3 ppm to 10 ppm;
(o) aceto-hydroxymethylbenzoic acid in an amount ranging from 1 ppm to 30 ppm, or ranging from 2 ppm to 20 ppm, or ranging from 3 ppm to 15 ppm;
(p) a-bromo-p-toluic acid in an amount ranging from 1 ppm to 100 ppm, or ranging from 2 ppm to 50 ppm, or ranging from 5 ppm to 25 ppm;
(q) Bromo-benzoic acid in an amount ranging from 5 ppm to 50 ppm, or ranging from 10 ppm to 40 ppm, or ranging from 15 ppm to 35 ppm;
(r) bromo-acetic acid in an amount ranging from 1 ppm to 10 ppm;
(s) an amount of p-tolualdehyde in the range of 7 to 50 ppm, or in the range of 8 to 25 ppm, or in the range of 9 to 20 ppm;
(t) terephthalaldehyde in an amount in the range of 0.25 ppm to 10 ppm, or in the range of 0.5 ppm to 5 ppm, or in the range of 0.75 ppm to 2 ppm; and optionally
(4) At least one, or at least 2, or at least 3, or at least 4, or at least 5, or at least 6, or at least 7 or all of the following:
(a) an amount of isophthalic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 5000 ppm, or in the range of 5 ppm to 2500 ppm, or in the range of 10 ppm to 2000 ppm, or in the range of 15 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(b) phthalic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 3000 ppm, or in the range of 2 ppm to 2000 ppm, or in the range of 3 ppm to 1000 ppm, or in the range of 4 ppm to 500 ppm;
(c) trimellitic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 3000 ppm, or in the range of 5 ppm to 2000 ppm, or in the range of 10 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(d) benzoic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 3000 ppm, or in the range of 5 ppm to 2000 ppm, or in the range of 10 ppm to 1000 ppm, or in the range of 20 ppm to 500 ppm;
(e) an amount of 4-hydroxybenzoic acid of at least 1 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 5 ppm to 400 ppm, or in the range of 10 ppm to 200 ppm;
(f) 4-hydroxymethylbenzoic acid in an amount of at least 1 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 5 ppm to 400 ppm, or in the range of 10 ppm to 200 ppm;
(g) 4,4′-dicarboxybiphenyl in an amount of at least 1 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 5 ppm to 400 ppm, or in the range of 10 ppm to 200 ppm;
(h) 2,6-dicarboxyanthraquinone in an amount of at least 0.1 ppm, or in the range of 0.1 ppm to 5 ppm, or in the range of 0.2 ppm to 4 ppm, or in the range of 0.3 ppm to 3 ppm;
Here, the one or more compounds selected in (4) are different from the one or more compounds selected in (3).

II. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of terephthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 4-carboxybenzaldehyde (4-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of 4-carboxybenzaldehyde (4-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 4-CBA and p-TA ranges from 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least 2 or at least 3 or at least 4 or at least 5 or at least 6 or all of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) trimellitic acid in the range of 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) 4,4′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or an amount in the range of 49 wt%;
(d) phthalic acid, at least 20 ppm, or at least 50 ppm, or at least 100 ppm, in the range of 20 ppm to 1000 ppm, in the range of 50 ppm to 750 ppm, in the range of 100 ppm to 500 ppm, or in the range of 20 ppm, or 50 ppm, or 100 ppm to 500 ppm, or 750 ppm; Or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 750ppm, or 1000ppm 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(e) 4-hydroxybenzoic acid in the range of 3 ppm to 200 ppm, or in the range of 5 ppm to 175 ppm, or in the range of 20 ppm to 150 ppm, or 3 ppm, or 5 ppm, or 20 ppm to 150 ppm, or 175 ppm, or 200 ppm, or 500 ppm; Or in the range of 1000 ppm;
(f) 4-hydroxymethylbenzoic acid at least 40 ppm, or at least 80 ppm, or at least 100 ppm, or in the range of 40 ppm to 200 ppm, or in the range of 80 ppm to 180, or in the range of 100 ppm to 160 ppm, or 40 ppm, or 80 ppm, or An amount ranging from 100 ppm to 500 ppm, or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(g) Benzoic acid in the range of 60 ppm to 500 ppm, or 75 ppm to 400 ppm, or 100 ppm to 300 ppm, or 60 ppm, or 75 ppm, or 100 ppm to 300 ppm, or 500 ppm, or 1000 ppm.

III. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of terephthalic acid Greater than, or greater than 97%, or greater than 98%, greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 4-carboxybenzaldehyde (4-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of 4-carboxybenzaldehyde (4-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 4-CBA and p-TA is 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least 2 or at least 3 or at least 4 or all of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) trimellitic acid in the range of 140 ppm to 1000 ppm, or in the range of 175 ppm to 750 ppm, or in the range of 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) 4,4 "-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%.
(d) at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or 20 ppm to 1000 ppm, or 50 ppm to 750 ppm, or 100 ppm to 500 ppm, or 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm. , Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(e) Benzoic acid in the range of 60 ppm to 500 ppm, or 75 ppm to 400 ppm, or 100 ppm to 300 ppm, or 60 ppm, or 75 ppm, or 100 ppm to 300 ppm, or 500 ppm, or 1000 ppm.

IV. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of terephthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 4-carboxybenzaldehyde (4-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, ranging from 1 ppm to 250 ppm, ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of 4-carboxybenzaldehyde (4-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 4-CBA and p-TA ranges from 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least two, or at least three, or all of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500 ppm, or 1000 ppm, or 2000 ppm, or 0.5 wt%, 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;
(b) trimellitic acid in the range of 140 ppm to 1000 ppm, or in the range of 175 ppm to 750 ppm, or in the range of 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) 4,4′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or an amount in the range of 49 wt%;
(d) at least 20 ppm, or at least 50 ppm, or at least 100 ppm, or 20 ppm to 1000 ppm, or 50 ppm to 750 ppm, or 100 ppm to 500 ppm, or 20 ppm, 50 ppm, 100 ppm to 500 ppm, or 750 ppm. , Or 1000 ppm, or 2000 ppm, or 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%, or 500 ppm, or 750 ppm, or 1000 ppm An amount in the range of ~ 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%;

V. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of terephthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 4-carboxybenzaldehyde (4-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of 4-carboxybenzaldehyde (4-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 500 ppm, ranging from 1 ppm to 250 ppm, ranging from 1 ppm to 125 ppm;
Where the total concentration of 4-CBA and p-TA ranges from 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) At least two or all of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) trimellitic acid in the range of 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) 4,4′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%.

VI. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of terephthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 4-carboxybenzaldehyde (4-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of 4-carboxybenzaldehyde (4-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 4-CBA and p-TA ranges from 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) trimellitic acid in the range of 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;

VII. In an embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of terephthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 4-carboxybenzaldehyde (4-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of 4-carboxybenzaldehyde (4-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 500 ppm, ranging from 1 ppm to 250 ppm, ranging from 1 ppm to 125 ppm;
Where the total concentration of 4-CBA and p-TA ranges from 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) 4,4′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or an amount in the range of 49 wt%;

VIII. In an embodiment of the invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of terephthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) (a) 4-carboxybenzaldehyde (4-CBA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(b) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 1000 ppm, or ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm; or
(c) Both:
(1) an amount of 4-carboxybenzaldehyde (4-CBA) in the range of 1 ppm to 1000 ppm, or in the range of 1 ppm to 500 ppm, or in the range of 1 ppm to 250 ppm, or in the range of 1 ppm to 125 ppm;
(2) p-toluic acid (p-TA) in an amount ranging from 1 ppm to 500 ppm, or ranging from 1 ppm to 250 ppm, or ranging from 1 ppm to 125 ppm;
Where the total concentration of 4-CBA and p-TA ranges from 1 ppm to 2000 ppm, 1 ppm to 1000 ppm, or 1 ppm to 500 ppm, or 1 ppm to 250 ppm, or 1 ppm to 125 ppm; and
(3) Both:
(a) trimellitic acid in the range of 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(b) 4,4′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%.

IX. In another embodiment of the present invention, the dry carboxylic acid composition (280) contains:
(1) More than 50%, or more than 60%, or more than 70%, or more than 80%, or more than 90%, or 95% by weight of terephthalic acid Greater than, or greater than 97%, or greater than 98%, or greater than 98.5%, or greater than 99%, or greater than 99.5% by mass; and
(2) 4-carboxybenzaldehyde (4-CBA) in an amount ranging from 1 ppm to 500 ppm, and
(3) All of the following:
(a) Isophthalic acid at least 50 ppm, or in the range of 50 ppm to 2000 ppm, or in the range of 75 ppm to 1500 ppm, or in the range of 100 ppm to 1000 ppm, or in the range of 150 ppm to 500 ppm, or in the range of 50 ppm, or 75 ppm, or 100 ppm, or 150 ppm 500ppm, or 1000ppm, or 2000ppm, or 0.5wt%, or 1wt%, or 2wt%, or 3wt%, or 5wt%, or 10wt%, or 25wt%, or 49wt%, or 500ppm, or 1000ppm to 2000ppm Or an amount in the range of 0.5 wt%, or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%;
(b) trimellitic acid in the range of 140 ppm to 1000 ppm, or 175 ppm to 750 ppm, or 200 ppm to 500 ppm, or 150 ppm, or 175 ppm, or 200 ppm to 500 ppm, or 750 ppm, or 1000 ppm;
(c) 4,4′-dicarboxybiphenyl in the range of 20 ppm to 150 ppm, or 25 ppm to 100 ppm, or 25 ppm to 75 ppm, or 200 ppm, or 300 ppm, or 500 ppm to 1000 ppm, or 2000 ppm, or 0.5 wt. %, Or 1 wt%, or 2 wt%, or 3 wt%, or 5 wt%, or 10 wt%, or 25 wt%, or 49 wt%.

  In another embodiment of the present invention, all of the above-mentioned dry carboxylic acid composition (280) compositions further contain less than 1000 ppm, or 500 ppm, or 250 ppm, or 100 ppm of the catalyst composition. Other ranges are less than 85 ppm and less than 50 ppm. Yet another range is less than 25 ppm, or less than 15 ppm, less than 10 ppm, or less than 5 ppm. In another embodiment of the invention, the catalyst contains cobalt and manganese. In another embodiment of the invention, the catalyst contains cobalt.

  All concentrations throughout the disclosure and “claims” are on a dry solid basis. The physical form of the TPA product can be a dry solid, a wet cake, a paste, or a slurry. To ensure consistency, any liquid present in the TPA product is ignored when describing its composition. The composition is expressed as mass% or ppmw (parts per million) based on dry solids assumed to be free of moisture in the product. For example, 500 ppmw of p-toluic acid in the TPA product means that 500 g of p-toluic acid is present for every 1,000,000 g of non-liquid mass in the product, regardless of the actual physical form of the product. Means. All measurements expressed in ppm are ppm by mass. Therefore, ppm is equivalent to ppmw throughout this description.

  In another aspect of the present invention, all compositions mentioned above are average compositions over a continuous period of operation at steady state. In yet another embodiment of the invention, the composition disclosed above is a time average composition obtained over 7 days, or 14 days, or 30 days during continuous operation. In another embodiment of the invention, the composition disclosed above can comprise any sample obtained from a 1 metric ton lot (1000 kg) or more. In another embodiment of the present invention, the previously disclosed composition comprises a sample in a shipping container, or a shipping container containing at least 500 kg of the disclosed composition.

  In embodiments of the present invention, the composition of matter identified by the inventors creates a PET that is subsequently used in manufacturing a coating, resin, fiber, film, sheet, container, or other shaped product. Would be used to do.

  In an embodiment of the invention, the composition disclosed above can have a functional group number in PET polymerization that ranges from 0 to at least 3. Functional groups for polycondensation of polyesters and copolyesters, as well as polyamides, copolyamides, and other co-polycondensation polymers include reactive carboxyl groups and reactive hydroxyl groups. The following discussion focuses on the effects of various impurities or oxidation byproducts on the production and properties of poly (ethylene terephthalate) (PET) as an example.

  Zero-functional impurities are removed either by a sweeping process in PET manufacture or by end up as a dilute species in PET. Mono- and tri-functional species probably affect the polymerization rate, both in the melt-phase and solid-states, but it is usually difficult to obtain high molecular weights, especially due to the presence of monofunctional chain-terminating species. There is therefore more influence in the solid-state. Depending on the concentration, mono- and tri-functional species also affect PET product properties through changes in molecular weight PET polydispersity.

  For example, p-toluic acid (p-TA) is a monofunctional impurity in PET polymerization with a PET process polymerization catalyst. In contrast, 4-carboxybenzaldehyde (4-CBA) is monofunctional when used with Sb (antimony) catalyst in PET polymerization, but is used with Ti (titanium) catalyst in PET polymerization. In some cases, it is di- or trifunctional for the conversion of aldehyde groups to hemi-acetals or acetals. Trimellitic acid (1,2,4-benzenetricarboxylic acid, or TMA) is a trifunctional impurity. Due to the initial approximation, mono- and trifunctional impurities have the effect of counteracting PET polymerization. That is, increased amounts of monofunctional impurities such as p-toluic acid, benzoic acid, monocarboxyfluorenone, bromo-benzoic acid, bromo-acetic acid, and 4-CBA (depending on the Sb catalyst) are trimellitic acid, 2 , 5,4'-tricarboxybiphenyl, 2,5,4'-tricarboxybenzophenone, and offset by increased concentrations of tri- or larger functional impurities such as 4-CBA (with Ti catalyst) obtain. When comparing the polymerizing action of impurities having functionalities other than two, and the relative reactivity of reactive groups (mainly carboxyl functionality) when the functionality is greater than one, it is not a mass-based concentration, Molar concentrations must be used. Fortunately, most of the impurities present in PTA at significant concentrations (greater than a few ppmw) are bifunctional and thus have a detrimental effect on PET polymerization due to their functionality. As well as they have no detrimental effect on PET polymer properties due to their low concentration. In particular, assuming a Sb-catalyzed PET polymerization process, each 10 ppmw TMA approximately offsets about 0.60 ppmw benzoic acid (BA), or 0.65 ppmw p-TA, due to molecular weight differences. If analytical information, i.e. the concentration of impurities and their functionality, is known for PTA impurities, the relative overall effect on PET polymerization can be estimated.

  For IPA instead of TPA, these compounds include 3-hydroxybenzoic acid, 3-hydroxymethylbenzoic acid, 3,3′-dicarboxybiphenyl, dicarboxyanthraquinone isomers, and 3,3′-dicarboxystilbene. Please note that. Similarly with respect to carboxylic acids, these compounds would be hydroxybenzoic acid isomers, hydroxymethylbenzoic acid isomers, dicarboxybiphenyl isomers, dicarboxyanthraquinone isomers, dicarboxystilbene isomers, and the like.

  In another embodiment of the present invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid is a total monofunctional compound (s) concentration of less than 0.5 mol%. Or less than 0.25 mol%, or less than 0.1 mol%, or less than 0.05 mol%, or less than 0.025 mol%, or less than 0.01 mol%, or less than 0.005 mol%.

  In another embodiment of the present invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid has a total monofunctional compound (s) concentration of less than 5000 ppm, or It will have less than 2500 ppm, or less than 1000 ppm, or less than 500 ppm, or less than 250 ppm, or less than 100 ppm, or less than 50 ppm.

  In another embodiment of the present invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid comprises a total trifunctional compound (s) and greater than trifunctional Having a concentration of compound (s) of less than 0.5 mol%, or less than 0.25 mol%, or less than 0.1 mol%, or less than 0.05 mol%, or less than 0.025 mol%, or less than 0.01 mol%, or less than 0.005 mol% I will.

  In another embodiment of the present invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid comprises a total trifunctional compound (s) and greater than trifunctional It will have a concentration of compound (s) of less than 5000 ppm, or less than 2500 ppm, or less than 1000 ppm, or less than 500 ppm, or less than 250 ppm, or less than 100 ppm, or less than 50 ppm.

  In another embodiment of the present invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid comprises a concentration of 0.5 mol% of total zero-functional compound (s). Will have less than, or less than 0.25 mol%, or less than 0.1 mol%, or less than 0.05 mol%, or less than 0.025 mol%, or less than 0.01 mol%, or less than 0.005 mol%.

  In another aspect of the present invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid comprises a concentration of total zero-functional compound (s), less than 5000 ppm, Or less than 2500 ppm, or less than 1000 ppm, or less than 500 ppm, or less than 250 ppm, or less than 100 ppm, or less than 50 ppm.

  In another embodiment of the present invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid has an average functionality of zero functionality, at least 1.995 or less. Greater than, or at least 1.996 or greater, or at least 1.997 or greater, or at least 1.998 or greater, or at least 1.999 or greater, or at least 1.9995 or greater, or Have at least 1.9999 or greater.

  In another embodiment of the present invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid has an average functionality of 1.95, or 1.996 without zero functional species. Or 1.997, or 1.998, or 1.999, or 1.9995, or 1.9999 to 20000, or 20001, or 20005, or 2001, or 2002, or 2003, or 2004, or 2005.

  In another aspect of the invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid comprises an average carboxyl functional, zero-carboxyl functional species. At least 1.996 or greater, or at least 1.996 or greater, or at least 1.997 or greater, or at least 1.998 or greater, or at least 1.999 or greater, or at least 1.9995 or greater Or at least 1.9999 or greater.

  In another aspect of the invention, the previously disclosed carboxylic acid composition comprising terephthalic acid or isophthalic acid or any bifunctional carboxylic acid comprises an average carboxyl functional, zero-carboxyl functional species. Between 1.995, or 1.996, or 1.997, or 1.998, or 1.999, or 1.9995, or 1.9999 to 20000, or 20001, or 20005, or 2001, or 2002, or 2003, or 2004, or 2005.

  In another embodiment of the present invention, a process is provided for producing a concentrated composition (240), as shown in FIGS. 20A and 20B. In this embodiment, as shown in FIGS. 20A and B, the catalyst removal zone (180) is optional and a concentration zone (210) is required. All zones in FIGS. 20A and 20B have been previously described in this disclosure. It should be understood that the process zones described above can be utilized in any other logical order to produce a dry carboxylic acid composition (280). It should also be understood that if the process zones are reordered, the process conditions can be changed. It should also be understood that process zones can be used independently.

  In another aspect of the invention, each aspect can optionally include additional steps that include decolorizing the carboxylic acid or esterified carboxylic acid. Decolorization is preferably achieved by hydrogenation. Decolorization can occur anywhere after the primary oxidation zone (20).

  Decolorization of the carboxylic acid slurry or esterified carboxylic acid can be accomplished by any means known in the art and not limited to hydrogenation. However, for example, in one embodiment of the present invention, decolorization is achieved by reaction of carboxylic acid esterified with, for example, ethylene glycol with molecular hydrogen in the presence of a hydrogenation catalyst in a decolorization reactor zone. Resulting in a decolorized carboxylic acid solution or decolorized ester product. There are no particular restrictions on their shape or structure for the decolorization reactor zone, allowing the supply of hydrogen to achieve homogeneous contact with the catalyst of the carboxylic acid or ester product in the decolorization reactor zone An arrangement is provided. Typically, the hydrogenation catalyst is usually a single Group VIII metal or a combination of Group VIII metals. Preferably, the hydrogenation catalyst is selected from the group consisting of palladium, ruthenium, rhodium and combinations thereof. The decolorization reactor zone comprises a hydrogenation reactor that operates at a temperature and pressure sufficient to hydrogenate a portion of the characteristic yellow compound to a colorless derivative.

  In another embodiment of the invention, instead of utilizing the previously described drying zone, the concentrated composition (240) is routed directly to the esterification zone (310), as shown in FIG. You can turn it on. In this embodiment, the moisture of the concentrated composition (240) is predominantly water and the mass% acetic acid of the concentrated composition (240) is less than 10%, preferably less than 2%, most preferably Is less than 0.1%. “Mainly” as used herein means more than 85% of the total moisture mass.

  Thus, in an embodiment of the present invention, step (i) adds diol in conduit (600) to the concentrated composition (240) in esterification reactor zone (610) instead of drying, (620) removing a portion of the water and forming a carboxylic acid and diol mixture in the esterification reactor zone (610). The carboxylic acid and diol react to form a hydroxyalkyester stream 630. Hydroxyalkyl ester stream (630) contains a hydroxyalkyl ester compound.

  The diol in conduit (600) is introduced in a manner that exchanges moisture as the dominant slurrying liquid. This can be accomplished by introduction of the diol via conduit (600) as a saturated liquid at a temperature range of about 150 ° C to about 300 ° C. Preferably, the diol in conduit (600) is saturated at a temperature range of about 150 ° C. to about 300 ° C., with sufficient enthalpy to evaporate water to flow through conduit (320), or Introduced as superheated steam. Diols in conduit 600 are ethylene glycol, diethylene glycol, tri-ethylene glycol, 1,3-propanediol, 1,2-propanediol, 1,4-butanediol, 1,3-butanediol, cyclohexanedimethanol, neo Selected from the group consisting of pentyl glycol, other diols useful in making polyesters and copolyesters, and mixtures thereof. Preferably, the diol in conduit (600) is ethylene glycol. Alternatively, an external heat source can be used to introduce sufficient enthalpy to evaporate the water, which exits through conduit (620). The hydroxyalkyl ester stream mixture exits via conduit stream (630).

  The esterification reactor zone (610) operates at a temperature of about 240 ° C. or higher. The esterification reactor zone (610) preferably operates at a temperature range of about 260 ° C to about 280 ° C. The esterification reactor zone (610) operates at a pressure of about 40 psia to about 100 psia to produce esterification of the terephthalic acid and diol mixture to produce a hydroxyethyl ester of terephthalic acid.

  In another embodiment of the present invention, the concentrated composition (240) is routed directly to the liquid exchange zone (500) as shown in FIG. 17 instead of utilizing a drying zone as previously described. You can turn on. In this embodiment, the moisture of the concentrated composition (240) has a significant amount of solvent. As used herein, “significant amount” means greater than 1%, or greater than 2%, or greater than 5%, or greater than 10%, or greater than 15%. To do.

  The concentrated composition (240) is washed or “rinsed” by solvent exchange in the liquid exchange zone (500), where a portion of the initial solvent is exchanged with the exchange solvent to concentrate the exchange solvent. The resulting composition (246) is formed. The exchange solvent includes water, methanol, ethylene glycol, and any diol or monomer that is compatible with the polyester or copolyester manufacturing process. The exchange solvent concentrated composition (246) preferably has a moisture content in the range of 0.5-30% by weight, more preferably in the range of about 1-20% by weight, most preferably in the range of 1-5% by weight. It is moisture. The residual moisture of the exchange solvent concentrated composition (206) can include less than about 2% by weight of solvent, and another range is less than 5%, or less than 10%, or less than 20%. .

  In an embodiment of the invention, the exchange solvent is introduced into the liquid exchange zone (500). The exchange solvent is preferably introduced on a continuous basis. There are no restrictions regarding the temperature or pressure of the exchange solvent, including the use of vaporized water, steam, or a combination of water and steam as the cleaning liquid.

  The liquid exchange zone (500) includes at least one solid-liquid separator. A solid-liquid separation device can typically include, but is not limited to, the following types of devices: centrifuges, cyclones, rotating drum filters, belt filters, press filters, and the like. The solid-liquid separator can operate within a temperature range of about 5 ° C to 195 ° C. The liquid exchange zone and the catalyst removal zone can be in the same device, for example a belt filter. The exchange solvent concentrated composition (246) is then sent to the esterification zone (610) described above.

EXAMPLES Embodiments of the present invention are further illustrated by the following examples of their preferred embodiments, but it is understood that these examples are included for purposes of illustration only and are not intended to limit the scope. It will be.

PTA Retention Experiment The purpose of this experimental set is that retention of IPA in the cooled carboxylic acid composition stream (170) varies the cleaning liquid temperature and ratio of the cleaning liquid supply stream (175) in the catalyst removal zone (180). It was to decide how. All experiments utilized a bench scale Pannevis vacuum filter device. The cooled carboxylic acid composition stream (170) is obtained by collecting the crystallized slurry composition stream (160) whose slurry is 30 mass solids and boiling off the solvent until the solids reach 50%. Prepared. The slurry was then cooled to 30 ° C. to produce a cooled carboxylic acid composition stream (170), loaded onto a vacuum filter, and then washed with a cleaning liquid feed stream (175). Both cleaning solution ratio and cleaning solution temperature were varied in the experiment. Wash ratios 1 and 0.5 were used. Wash solution temperatures of 90 ° C. and 10 ° C. were used. The washing solution was 90% acetic acid and 10% water. The time after the addition of the washing solution until the dry top of the cake was recognized was called “Dry Top Time” and recorded. A sample of the composition (200) after catalyst removal was analyzed for ppm wt IPA.

Experiment 1 (without cleaning solution)
700.10 g of the crystallized slurry composition stream (160) was loaded into a stainless steel beaker. The slurry was heated until the slurry weight was reduced to 420 g. The slurry was rapidly cooled to 30 ° C. using wet ice to produce a cooled carboxylic acid composition stream (170). A cooled carboxylic acid composition stream (170) was fed to a bench scale Pannevis vacuum filter. After feeding the cooled carboxylic acid composition stream (170) to the vacuum filter, 16.5 g of the cooled carboxylic acid composition stream (170) remained in the steel beaker. The exact mass of the cooled carboxylic acid composition stream (170) to the filter was 403.5 g (420 g-16.5 g). The mass of the pre-catalyst removal composition stream of the wet cake was 266.38 g. The solid content of the wet cake was 94.2%. Samples from the wet cake were subjected to analysis for IPA analysis.

Experiment 2 (Cleaning liquid ratio 0.5, cleaning liquid temperature 90 ° C)
700.04 g of the crystallized slurry composition stream (160) was loaded into a stainless steel beaker. The slurry was heated until the slurry weight was reduced to 420.73 g. The slurry was rapidly cooled to 30 ° C. using wet ice to produce a cooled carboxylic acid composition stream (170). A cooled carboxylic acid composition stream (170) was fed to a bench scale Pannevis vacuum filter. After feeding the cooled carboxylic acid composition stream (170) to the vacuum filter, 16.5 g of the cooled carboxylic acid composition stream (170) remained in the stainless steel beaker. The exact mass of the cooled carboxylic acid composition stream (170) to the filter was 405.94 g (420.73 g-14.79 g). The filter cake was washed with a 100.18 g wash solution feed stream (175) of 90 ° C. acetic acid / water solution. The weight of composition stream 200 after catalyst removal of the wet cake was 232.83 g. The solid content of the composition stream (200) after catalyst removal of the wet cake was 99.2%. Samples from the wet cake were subjected to analysis for IPA analysis.

Experiment 3 (Cleaning liquid ratio 1.0, cleaning liquid temperature 90 ° C)
700.39 g of the crystallized slurry composition stream (160) was loaded into a stainless steel beaker. The slurry was heated until the slurry weight was reduced to 420.25 g. The slurry was rapidly cooled to 30 ° C. using wet ice to produce a cooled carboxylic acid composition stream (170). A cooled carboxylic acid composition stream (170) was fed to a bench scale Pannevis vacuum filter. After feeding the feed stream (170) to the vacuum filter, 12.69 g of stream (170) remained in the stainless steel beaker. The exact mass of stream (170) to the filter was 407.56g (420.25g-12.69g). The filter cake was washed with a 200.14 g wash feed stream 175 of 90 ° C. acetic acid / water solution. The weight of composition stream 200 after catalyst removal of the wet cake was 226.61 g. The solid content of the composition stream (200) after catalyst removal of the wet cake was 95.4%. A sample from the composition stream (200) after catalyst removal was subjected to analysis for IPA analysis.

Experiment 4 (cleaning liquid ratio 0.5, cleaning liquid temperature 10 ° C)
700.3 g of the crystallized slurry composition stream (160) was loaded into a stainless steel beaker. The slurry was heated until the slurry weight was reduced to 420.3 g. The slurry was rapidly cooled to 30 ° C. using wet ice to produce a cooled carboxylic acid composition stream (170). Stream (170) was fed to a bench scale Pannevis vacuum filter. After feeding stream (170) to the vacuum filter, 15.29 g of stream (170) remained in the stainless steel beaker. The exact mass of stream (170) to the filter was 405.01 g (420.3 g-15.29 g). The filter cake was washed with a 100.37 g wash feed stream (175) of 10 ° C. acetic acid / water solution. The weight of the composition stream (200) after catalyst removal of the wet cake was 248.84 g. The solid content of the composition stream (200) after catalyst removal of the wet cake was 90.75%. A sample from the composition stream (200) after catalyst removal was subjected to analysis for IPA analysis.

Experiment 5 (Cleaning liquid ratio 1.0, cleaning liquid temperature 10 ° C)
700.44 g of the crystallized slurry composition stream (160) was loaded into a stainless steel beaker. The slurry was heated until the slurry weight was reduced to 420.35 g. The slurry was rapidly cooled to 30 ° C. using wet ice to produce a cooled carboxylic acid composition stream (170). A cooled carboxylic acid composition stream (170) was fed to a bench scale Pannevis vacuum filter. After feeding stream (170) to the vacuum filter, 9.3 g of stream (170) remained in the stainless steel beaker. The exact mass of stream (170) to the filter was 411.05 g (420.35 g-9.3 g). The filter cake was washed with a 200.06 g wash solution feed stream (175) of 10 ° C. acetic acid / water solution. The weight of the composition stream (200) after catalyst removal of the wet cake was 222.06 g. The solid content of the composition stream (200) after catalyst removal of the wet cake was 89.55%. A sample from the composition stream (200) after catalyst removal was subjected to analysis for IPA analysis.

result

  It is clear that the retention of IPA varies depending on the cleaning solution temperature and the cleaning solution ratio, and it is possible to control the IPA content in the composition stream (200) after removing the catalyst. The range of IPA content in the stream (200) in the previous experiment varies from 146 ppm to 20 ppm depending on the amount and temperature of the wash liquor. The retention of selected oxidation by-products can be controlled by the temperature, composition and amount of the cleaning liquid feed stream (175) applied to the catalyst removal zone (180). This data illustrates the retention of oxidation by-products in the catalyst removal zone, utilizing IPA as an example. IPA is believed to represent that other oxidation by-products can exhibit similar retention behavior under a particular cleaning liquid temperature and cleaning liquid ratio combination.

Concentration of PTA with isophthalic acid The purpose of this experiment was to clarify the concentration of terephthalic acid.
In Experiment 1, the cooled carboxylic acid composition stream (170) slurry was loaded onto a bench scale Pannevis vacuum filter device and the resulting post-catalyst composition (200) was analyzed for IPA content.

  In Experiments 2 and 3, the cooled carboxylic acid composition stream (170) slurry was loaded onto a bench scale Pannevis vacuum filter apparatus and the resulting wet cake was washed with a wash feed stream (175) to give a composition after catalyst removal. The logistics (200) was analyzed for IPA content. The wash feed stream (175) contained 90 wt% acetic acid and 10 wt% water.

  In Experiments 4 and 5, the cooled carboxylic acid composition stream (170) slurry was loaded onto a bench scale Pannevis vacuum filter apparatus and the resulting wet cake was washed with a wash feed stream (175). The resulting post catalyst removal composition stream (200) wet cake was then washed with a concentrated feed stream (220) and the resulting concentrated carboxylic acid composition was analyzed for IPA content. Both the catalyst removal zone (180) and the enrichment zone (210) were performed with a bench scale Pannevis vacuum filter apparatus. The concentrated feed stream (220) used in experiments 4 and 5 was prepared in this manner. Acetic acid was heated to 80 ° C. and enough IPA was added until IPA no longer entered the solution.

Experiment 1 (no cake washing liquid, no concentrated washing liquid)
401.67 g of a cooled carboxylic acid stream (170) at 23.9 ° C. was fed to the catalyst removal zone (180), which is a bench scale Pannevis vacuum filter. There was no wash feed stream (175). The weight of the flow (200) wet cake was 145.55 g and the solids rate was 89.4%. A sample of the wet cake was subjected to analysis for IPA analysis.

Experiment 2 (80 ° C cake washing liquid, no concentrated washing liquid)
400.33 gg of the cooled carboxylic acid stream (170) slurry at 29.3 ° C. was fed to the catalyst removal zone (180), which is a bench scale Pannevis vacuum filter. The filter cake was washed with 100.11 g of an 80.2 ° C. wash feed stream (175). The resulting post-catalyst removal stream 200 weighed 139.49 g and the solids rate was 99.94%. A sample from composition 200 after catalyst removal was subjected to analysis for IPA analysis.

Experiment 3 (80 ° C cake washing liquid, no concentrated washing liquid)
401.17 g of a cooled carboxylic acid stream (170) at 24 ° C. was fed to the catalyst removal zone (180), which is a bench scale Pannevis vacuum filter. The filter cake was washed with 100.05 g of the 80.0 ° C. wash feed stream (175). The resulting catalyst removal back stream (200) weighed 124.07 g and the solids rate was 99.95%. A sample from the composition (200) after catalyst removal was subjected to analysis for IPA analysis.

Experiment 4 (80 ° C cake washing solution, 80 ° C concentrated washing solution)
400.45 g of the cooled carboxylic acid stream (170) at 24.3 ° C. was fed to the catalyst removal zone (180), which is a bench scale Pannevis vacuum filter. The filter cake was washed with 100.11 g of an 80.1 ° C. wash feed stream (175). The wet cake was then concentrated with 100.52 g of a concentrated feed stream (220) at 80.2 ° C. The weight of the resulting concentrated carboxylic acid composition stream 240 was 131.33 g, and the solid content was 99.9%. A sample of the concentrated carboxylic acid composition stream (240) was subjected to analysis for IPA analysis.

Experiment 5 (80 ° C cake washing solution, 80 ° C concentrated washing solution)
400.55 g of the cooled carboxylic acid stream (170) at 24.4 ° C. was fed to the catalyst removal zone (180), which is a bench scale Pannevis vacuum filter. The filter cake was washed with 100.28 g of an 80.2 ° C. wash feed stream (175). The wet cake was then concentrated with 100.54 g of a concentrated feed stream (220) at 80.0 ° C. The weight of the resulting concentrated carboxylic acid composition stream (240) was 144.54 g, and the solid content was 98.8%. A sample of the concentrated carboxylic acid composition stream (240) was subjected to analysis for IPA analysis.

result

  In Experiment 1, the wet cake was not washed, resulting in an IPA concentration of 2199 ppm. In Experiments 2 and 3, the wet cake was washed with stream (175) to yield a post catalyst composition (20) with an average IPA concentration of about 900 ppm. In Experiments 4 and 5, the post-catalyst composition (200) was concentrated in a concentrated stream (220) to yield a concentrated carboxyl composition (240) with an average IPA concentration of about 5000 ppm. From this data, it is clear that IPA was concentrated in stream (240) to a concentration above that of the post-catalyst composition. This data illustrates oxidation byproduct concentration in the concentration zone, utilizing IPA as an example. IPA is that the retention of other oxidation by-products in the catalyst removal zone is affected by the particle size distribution which affects the cleaning conditions, including cleaning solution ratio, cleaning solution solvent composition, and cleaning solution temperature, as well as cake thickness and cake porosity. Thus, it is considered representative of other oxidation byproducts.

Fig. 3 illustrates an embodiment of the invention in which a dried carboxylic acid composition (280) is produced. Fig. 3 illustrates an embodiment of the invention in which a dried carboxylic acid composition (280) is produced. Figure 3 illustrates various aspects of the invention in which a multi-liquid exchange zone (40) may be used. The crystallized slurry composition (160) represents an embodiment of the present invention that can be produced by a number of different processes. Fig. 4 illustrates an embodiment of the invention in which a crude carboxylic acid composition or slurry composition can be made by a number of different processes. FIG. 3 illustrates an embodiment of the invention in which a post-crystal removal composition (200) is made from a carboxylic acid composition (214) in a catalyst removal zone (180). The catalyst removal zone (180) and the concentration zone (210) represent an embodiment of the present invention used to produce a concentrated composition (240) from a cooled carboxylic acid composition (170). FIG. 4 illustrates an embodiment of the invention in which a concentrated composition (240) is produced from a post-catalyst composition (200) in a concentration zone (210).

Fig. 4 illustrates an embodiment of the present invention showing multiple concentrated feed (220) points. Various aspects of the invention are shown in which the carboxylic acid composition (214) and / or the crystallization slurry composition (160) are concentrated. Figure 3 illustrates various aspects of the present invention in which a carboxylic acid composition (214) is concentrated in an extended concentration zone (213). The enrichment zone (210) and catalyst removal zone (180) represent various aspects of the present invention that can be merged into at least one combined catalyst removal / concentration zone (181) or at least one device that performs both functions. Fig. 4 illustrates an embodiment of the invention showing multiple concentrated feeds (220) in a given process. Fig. 4 illustrates an embodiment of the invention showing multiple concentrated feeds (220) in a given process. Fig. 4 illustrates an embodiment of the invention showing multiple concentrated feeds (220) in a given process. Fig. 4 illustrates an embodiment of the invention showing multiple concentrated feeds (220) in a given process. FIG. 3 illustrates an embodiment of the invention in which the concentrated composition (240) is sent directly to the esterification reaction zone (610). FIG. 4 illustrates an embodiment of the invention in which a water-moist cake composition (246) is sent directly to the esterification reaction zone (610).

3 illustrates an embodiment of the invention in which an aromatic feedstock (10) is used to produce a concentrated composition (240). 3 illustrates an embodiment of the invention in which an aromatic feedstock (10) is used to produce a concentrated composition (240). Fig. 3 illustrates an embodiment of the invention in which a catalyst removal zone (180) is optional and a concentration zone (210) is required. Fig. 3 illustrates an embodiment of the invention in which a catalyst removal zone (180) is optional and a concentration zone (210) is required.

Claims (62)

(1) terephthalic acid in an amount greater than 50% by weight;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or
(b) p-toluic acid in an amount ranging from 1 ppm to 1000 ppm; or
(2) both (a) and (2) (b); and
(3) At least two of the following:
(a) isophthalic acid in an amount ranging from 50 ppm to 49 wt%;
(b) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm;
(c) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
(d) phthalic acid in an amount ranging from 20 ppm to 49 wt%;
(e) 4-hydroxybenzoic acid in an amount ranging from 3 ppm to 1000 ppm;
(f) 4-hydroxymethylbenzoic acid in an amount ranging from 40 ppm to 49 wt%; and
(g) A terephthalic acid composition comprising benzoic acid in an amount ranging from 60 ppm to 1000 ppm.   The terephthalic acid composition of claim 1, wherein the isophthalic acid is in an amount ranging from 50 ppm to 5 wt%.   The terephthalic acid composition according to claim 2, wherein the trimellitic acid is in an amount ranging from 175 ppm to 750 ppm.   The terephthalic acid composition of claim 3, wherein the 4,4'-dicarboxybiphenyl is in an amount ranging from 25 ppm to 1 wt%.   5. A terephthalic acid composition according to claim 4, wherein the phthalic acid is in an amount ranging from 20 ppm to 1 wt%.   6. The terephthalic acid composition according to claim 5, wherein the 4-hydroxybenzoic acid is in an amount ranging from 20 ppm to 1000 ppm.   7. The terephthalic acid composition according to claim 6, wherein the 4-hydroxymethylbenzoic acid is in an amount ranging from 40 ppm to 1 wt%.   7. The terephthalic acid composition according to claim 6, wherein the 4-hydroxymethylbenzoic acid is in an amount ranging from 40 ppm to 2000 ppm.   8. The terephthalic acid composition according to claim 7, wherein the benzoic acid is in an amount ranging from 60 ppm to 500 ppm.   The terephthalic acid composition of claim 1, wherein the isophthalic acid is in an amount ranging from 50 ppm to 1 wt%.   11. The terephthalic acid composition according to claim 10, wherein the trimellitic acid is in an amount ranging from 200 ppm to 500 ppm.   12. The terephthalic acid composition according to claim 11, wherein the 4,4′-dicarboxybiphenyl is in an amount ranging from 25 ppm to 2000 ppm.   13. A terephthalic acid composition according to claim 12, wherein the phthalic acid is in an amount ranging from 20 ppm to 2000 ppm.   14. A terephthalic acid composition according to claim 13, wherein the 4-hydroxybenzoic acid is in an amount ranging from 150 ppm to 1000 ppm.   15. A terephthalic acid composition according to claim 14, wherein the 4-hydroxymethylbenzoic acid is in an amount ranging from 40 ppm to 0.5 wt%.   16. A terephthalic acid composition according to claim 15, wherein the benzoic acid is in an amount ranging from 60 ppm to 300 ppm. (1) terephthalic acid in an amount greater than 50% by weight;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or
(b) p-toluic acid in an amount ranging from 1 ppm to 1000 ppm; or
(2) both (a) and (2) (b); and
(3) At least three of the following:
(a) isophthalic acid in an amount ranging from 50 ppm to 49 wt%;
(b) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm;
(c) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
(d) phthalic acid in an amount ranging from 20 ppm to 49 wt%;
(e) 4-hydroxybenzoic acid in an amount ranging from 3 ppm to 1000 ppm;
(f) 4-hydroxymethylbenzoic acid in an amount ranging from 40 ppm to 49 wt%; and
(g) A terephthalic acid composition comprising benzoic acid in an amount ranging from 60 ppm to 1000 ppm.   The terephthalic acid composition of claim 17, wherein the isophthalic acid is in an amount in the range of 50 ppm to 5 wt%.   19. A terephthalic acid composition according to claim 18, wherein the trimellitic acid is in an amount ranging from 175 ppm to 750 ppm.   20. A terephthalic acid composition according to claim 19, wherein the 4,4'-dicarboxybiphenyl is in an amount ranging from 25 ppm to 1 wt%.   21. The terephthalic acid composition according to claim 20, wherein the phthalic acid is in an amount ranging from 20 ppm to 1 wt%.   The terephthalic acid composition of claim 21, wherein the 4-hydroxybenzoic acid is in an amount in the range of 20 ppm to 1000 ppm.   23. The terephthalic acid composition according to claim 22, wherein the 4-hydroxymethylbenzoic acid is in an amount ranging from 40 ppm to 1 wt%.   24. The terephthalic acid composition of claim 23, wherein the benzoic acid is in an amount ranging from 60 ppm to 500 ppm.   The terephthalic acid composition of claim 17, wherein the isophthalic acid is in an amount in the range of 50 ppm to 1 wt%.   26. The terephthalic acid composition of claim 25, wherein the trimellitic acid is in an amount in the range of 200 ppm to 500 ppm.   27. The terephthalic acid composition of claim 26, wherein the 4,4'-dicarboxybiphenyl is in an amount ranging from 25 ppm to 2000 ppm.   28. The terephthalic acid composition of claim 27, wherein the phthalic acid is in an amount in the range of 20 ppm to 2000 ppm.   29. A terephthalic acid composition according to claim 28, wherein the 4-hydroxybenzoic acid is in an amount ranging from 150 ppm to 1000 ppm.   30. The terephthalic acid composition of claim 29, wherein the 4-hydroxymethylbenzoic acid is in an amount ranging from 40 ppm to 0.5 wt%.   31. A terephthalic acid composition according to claim 30, wherein the benzoic acid is in an amount ranging from 60 ppm to 300 ppm. (1) terephthalic acid in an amount greater than 50% by weight;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or
(b) p-toluic acid in an amount ranging from 1 ppm to 1000 ppm; or
(2) both (a) and (2) (b); and
(3) At least two of the following:
(a) isophthalic acid in an amount of at least 50 ppm;
(b) trimellitic acid in the range of 140 ppm to 1000 ppm; and
(c) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%: terephthalic acid composition.   33. A terephthalic acid composition according to claim 32, wherein the isophthalic acid is in an amount ranging from 50 ppm to 5 wt%.   34. The terephthalic acid composition of claim 33, wherein the trimellitic acid is in an amount ranging from 175 ppm to 750 ppm.   35. The terephthalic acid composition of claim 34, wherein the 4,4'-dicarboxybiphenyl is in an amount ranging from 25 ppm to 1 wt%. (1) terephthalic acid in an amount greater than 50% by weight;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or
(b) p-toluic acid in an amount ranging from 1 ppm to 1000 ppm; or
(2) both (a) and (2) (b); and
(3) All of the following:
(a) isophthalic acid in an amount of at least 50 ppm;
(b) trimellitic acid in the range of 140 ppm to 1000 ppm;
(c) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%: terephthalic acid composition.   37. The terephthalic acid composition of claim 36, wherein the isophthalic acid is in an amount ranging from 50 ppm to 5 wt%.   38. The terephthalic acid composition of claim 37, wherein the trimellitic acid is in an amount ranging from 175 ppm to 750 ppm.   40. The terephthalic acid composition of claim 38, wherein the 4,4'-dicarboxybiphenyl is in an amount ranging from 25 ppm to 1 wt%. (1) terephthalic acid in an amount greater than 50% by weight;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or
(b) p-toluic acid in an amount ranging from 1 ppm to 1000 ppm; or
(2) both (a) and (2) (b); and
(3) At least five of the following:
(a) isophthalic acid in an amount ranging from 50 ppm to 49 wt%;
(b) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm;
(c) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
(d) phthalic acid in an amount ranging from 20 ppm to 49 wt%;
(e) 4-hydroxybenzoic acid in an amount ranging from 3 ppm to 1000 ppm;
(f) 4-hydroxymethylbenzoic acid in an amount ranging from 40 ppm to 49 wt%; and
(g) A terephthalic acid composition comprising benzoic acid in an amount ranging from 60 ppm to 1000 ppm.   41. The terephthalic acid composition of claim 40, wherein the isophthalic acid is in an amount ranging from 50 ppm to 5 wt%.   42. The terephthalic acid composition of claim 41, wherein the trimellitic acid is in an amount ranging from 175 ppm to 750 ppm.   43. The terephthalic acid composition of claim 42, wherein the 4,4'-dicarboxybiphenyl is in an amount ranging from 25 ppm to 1 wt%.   44. The terephthalic acid composition of claim 43, wherein the phthalic acid is in an amount ranging from 20 ppm to 1 wt%.   45. The terephthalic acid composition of claim 44, wherein the 4-hydroxybenzoic acid is in an amount in the range of 20 ppm to 1000 ppm.   46. The terephthalic acid composition of claim 45, wherein the 4-hydroxymethylbenzoic acid is in an amount ranging from 40 ppm to 1 wt%.   47. The terephthalic acid composition of claim 46, wherein the benzoic acid is in an amount ranging from 60 ppm to 500 ppm. (1) terephthalic acid in an amount greater than 50% by weight;
(2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or
(b) p-toluic acid in an amount ranging from 1 ppm to 1000 ppm; or
(2) both (a) and (2) (b); and
(3) All of the following:
(a) isophthalic acid in an amount ranging from 50 ppm to 49 wt%;
(b) trimellitic acid in an amount ranging from 140 ppm to 1000 ppm;
(c) 4,4′-dicarboxybiphenyl in an amount ranging from 25 ppm to 49 wt%;
(d) phthalic acid in an amount ranging from 20 ppm to 49 wt%;
(e) 4-hydroxybenzoic acid in an amount ranging from 3 ppm to 1000 ppm;
(f) 4-hydroxymethylbenzoic acid in an amount ranging from 40 ppm to 49 wt%; and
(g) A terephthalic acid composition comprising benzoic acid in an amount ranging from 60 ppm to 1000 ppm.   49. The terephthalic acid composition of claim 48, wherein the isophthalic acid is in an amount ranging from 50 ppm to 5 wt%.   50. The terephthalic acid composition of claim 49, wherein the trimellitic acid is in an amount ranging from 175 ppm to 750 ppm.   51. The terephthalic acid composition of claim 50, wherein said 4,4'-dicarboxybiphenyl is in an amount ranging from 25 ppm to 1 wt%.   52. The terephthalic acid composition of claim 51, wherein the phthalic acid is in an amount ranging from 20 ppm to 1 wt%.   53. The terephthalic acid composition of claim 52, wherein the 4-hydroxybenzoic acid is in an amount in the range of 20 ppm to 1000 ppm.   54. The terephthalic acid composition of claim 53, wherein the 4-hydroxymethylbenzoic acid is in an amount ranging from 40 ppm to 1 wt%.   55. A terephthalic acid composition according to claim 54, wherein the benzoic acid is in an amount ranging from 60 ppm to 500 ppm.   49. The terephthalic acid composition of claim 48, wherein the isophthalic acid is in an amount ranging from 50 ppm to 1 wt%.   57. A terephthalic acid composition according to claim 56, wherein the trimellitic acid is in an amount ranging from 200 ppm to 500 ppm.   58. A terephthalic acid composition according to claim 57, wherein said 4,4'-dicarboxybiphenyl is in an amount ranging from 25 ppm to 2000 ppm.   59. A terephthalic acid composition according to claim 58, wherein the phthalic acid is in an amount ranging from 20 ppm to 2000 ppm.   60. The terephthalic acid composition of claim 59, wherein the 4-hydroxybenzoic acid is in an amount ranging from 150 ppm to 1000 ppm.   61. The terephthalic acid composition of claim 60, wherein the 4-hydroxymethylbenzoic acid is in an amount ranging from 40 ppm to 0.5 wt%.   62. A terephthalic acid composition according to claim 61, wherein the benzoic acid is in an amount ranging from 60 ppm to 300 ppm.

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